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Патент USA US2135471

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Nov. 1, 1938.
A. P. B. RENSHAW
2,135,471
TRAFFIC CONTROL SIGNAL
Filed Feb. l, 1935
AC'.
2 Sheets-Sheet l
Nov. 1, 1938.
A. P. EsgREhlsi-lßxwy
2,135,471
TRAFFIC CONTROL SIGNAL
Filed Feb. l, >1955
2 Sheets-Sheet 2
A TTORNÉ Y?
2,135,471
Patented Nov. 1, 1938
um'rlazov STATES PATENT OFFICE
2,135,471
TRAFFIC CONTROL SIGNAL
Alfred Percy Bailey Renshaw, Kingston Hill, Eng
land, assigner, by. mesne assignments, to Auto
matic Telephone & Electric Company Lim
ited, London, England
Application February 1, 1935, Serial No. 4,454
In Great Britain February 14, 1934
12 Claims. (Cl. 177-337)
The present invention relates to trañic control
signals for use at road junctions or the like and
is more particularly concerned with systems in
which thev period of display of the appropriate
5 signals is controlled by vehicle detectors located
in the various trafiic routes. In systems of this
type the purpose of going to the extra expense
of providing vehicle detectors is to ensure by their
use that right of way shall never be retained
10 by a road on which there is no traffic while traffic
is Waiting to pass on an intersecting road. It
is usually arranged that a vehicle actuating a de
tecto-r secures to itself right of way for a period
sufficient to enable it to clear the crossing and
this period may vary in accordance with the
speed of the vehicle.
Accordingly the length of
the right of way period allowed to any one road
may be repeatedly extended if vehicles` follow
yzo
each other suñiciently closely thereon, and in
order that vehicles on an intersecting road shall
not be unduly held up it is usual to provide sep
arate timing means to set a limit to the time
during which one road can hold right of way if
25
vehicles are waiting on an intersecting road.
It is also recognized that if a number of ve
hicles are brought to rest while they are await
ing right rof way, an additional time will be
necessary to permit them to get into motion and
clear the crossing. It has been suggested that
30 this additional time should be proportional to
the number of vehicles waiting but an allow
ance on this basis is unduly extravagant and a
compromise which is found reasonably satisfac
tory in practice is to allow a short ñxed period to
35 coverl the delay involved in starting up from rest.
This period Vhas become known as the initial
interval as distinct from the vehicle interval
which represents the maximum extension which
can be obtained by a slow moving vehicle actu
40 ating the detector at a time when the road in
question possesses right o-f Way. Thus with this
arrangement a single vehicle approaching the
intersection in the- absence of other trañic would
generate a right of way period made up» of the
45 initial interval and one vehicle interval and this
itial interval and this time period may therefore
be made available to the intersecting road if there
is any traffic thereon. The chief object of the
invention is to provide a simple arrangement
whereby this refinement may be secured in prac
tice and thus the advantages of the vehicle-ac
tuated type of system are still further increased
as against the ñxed time system.
According to one object of the invention in a.
trali‘ic signalling system arranged to give right
of way to a number of intersecting trahie routes
in turn under the control of vehicle detectors
located in one or more of the traffic routes right
of Way is normally displayed to any one lane for
a predetermined minimum period but is adapted 15
to be displayed for a shorter period under par
ticular traffic conditions.
According to another object of the invention,
in a traflic signalling system arranged to give
right of way to a number of intersecting trañic 20
routes in turn under the control of vehicle de
tectors located in one o-r more of the traflic routes
due to a vehicle actuating a detector in a traffic
route not possessing right of way, right of way
is secured to that route for a predetermined 25
period while if this right of way is not given im
mediately a further period is secured to the traf
fic route to compensate for the check to the
speed of the vehicle.
A further object of the invention is to provide 30
in a traffic signalling system arranged to give
right of way to a number of intersecting traflic
routes in turn under the control of vehicle de
tectors located in one or more of the traffic
routes and arranged so that the period during 35
which right of way is displayed comprises an
initial interval designed to give waiting vehicles
time to get into motion and one or more vehicle
intervals each representing the extension pro
duced by an operation of the detector at a time 40
when the traffic route in which it is located pos
sesses right of way, that if the operation of
the detector in one route results in right of way
being transferred immediately to that route,
the initial interval on that route is substantial
45
would 4represent the minimum time during which
right of way could be displayed.
It has been found that with suitable choice
The invention will be better understood from
the following description of one method of car
of _the initial and vehicle intervals to meet local
rying it into effect, and which may advantageous
conditions this arrangement gives good results
ly be employed with a right of way controller 50
whose operation is dependent upon actuation of
but a refinement is possible in the case in which
a vehicle receives right of' way immediately it
actuates the detector and therefore does not
need to slow down. It will be appreciated that
55. in this case there is no need to provide any in
ly reduced.
traffic actuatable detectors in one or more of the
several approaches to> the intersection.
The description will be made clearer with refer
ence to the accompanying drawings which illus
5.5
2
2,135,471
trate one practical embodiment of the invention,
and in which
Figure 1 is a wiring diagram of a type of right
of way controller whose operation through its
cycle of signal indications is dependent upon
actuation of traiîic actuatable detectors in the
are closed, a circuit is completed over armature
d2 for striking tube FA so that relay A is ener
gized and the solenoid is operated at armature al
and the cam shaft is moved to position l. In this
position the lamp REW remains operated, lamp
ANS is lighted in place of GNS, and lamp AEW is
several approaches tol the intersection.
lighted in addition to lamp ANS if the switch AS
Figure 2 shows the modifications required in
is closed. Moreover, a new charging circuit is
accordance with the invention in a right of way » completed for condenser QA over cam contacts
controller of the type shown in Figure 1 so that
CIS, the adjusting switch LNS and the appropri
it will function as outlined above.
ate charging resistance. Relay D moreover was
locked up over armature dl and contacts Cl' so
that as soon as the condenser QA has been
charged suiiiciently which will occur after a few
'
` " '
" '
An embodiment of right of way controller for
use at intersections of interfering trafñc lanes
which may advantageously employ the apparatus
15 of the present invention will now be described.
Signal indications from a controller ofV this type
are operated in accordance with the density of
the traffic by the employment of vehicle detec
tors located in the roadway.
20
"
'
as by electromagnetic, photo-electric, or other
means.
The controller diagrammatically represented
in Figure l is provided with a number of sets of
_ contacts operated by a camshaft which is moved
through its cycle step by step by means of a
solenoid. The stepping of the solenoid is con
trolled fromy a timing circuit which may employ ak
gas discharge tube-condenser combination, the
timing being variable and under the control of
vehicle detectors in the roadway. Two separate
timing circuits are employed and two road relays
pleted for condenser QA, this time over contact 20
C|4 and» switch IEW. Consequently, after the
period corresponding to the resistance now in
cluded in the charging circuit, relay A is again
operated and the solenoid steps the cam shaft
to position 3. This produces no change in the 25
lights but the charging circuit for condenser QA
now extends over contact CIS and the switch
VEW and moreover relay D is de-energized by
the opening of contacts C1 while owing to the
closure of contact CIG a circuit is prepared for 30.
shunting condenser QA. If there is no further
traflic, right of way will remain on the EW road
and the condenser QA will become fully charged.
If further Vehiclesarrive on the EW road how
ever relay D isY again operated and shunts the
condenser by way of the comparatively low resist
which respond to the passage of vehicles over the
ance YE and contacts CBS and d2 and thus ex
detectors are provided.
tends the time which will be required for the con
-
n
The current supply is assumed to be taken from
40 alternating current mains and. is rectiñed to pro
vide direct current for the operation of the dis
charge tubes.v The transformer XFR. feeds the
valve rectifier VR. The live pole of the A. C.
circuits is represented by a plus in a circle, `the
el.) live pole of the D. C.` circuits by a plus in a square,
and the common grounded pole by a minus in a
circle and a quare. 'I_‘he chart shows'the postions
of the camshaft in which the various cam con
tacts are closed. The various contacts of the
several interval adjusting switches INS, VNS,
IEW, VEW, LNS, LEW, are wired to- appropriate
tapping points of the resistance 20, and similarly
the switches MNS, and MEW are wired to resist
ance 2| which gives tappings of higher value.
15
Furthermore a new charging circuit is now com
Vehicle detectors may be of the type in which
two resilient conductor sheets are flexed into con
tact with each other by the weight of a passing
vehicle, or any other type which will upon the
passage of a vehicle control an operating circuit,
ci: u
seconds only, relay A is again operated and ad
vances the cam shaft to position 2. In this posi
tion lamps GEW and RNS only are lighted and
the vehicle in the street EW secures right of way.
denser to be charged to the striking Voltage ,of the
discharge tube FA. It may be pointed out that 40'
since in these circumstances relay D is only oper
ated while the vehicle is actually passing over the
detector pad, the amount of extension obtained
is dependent on the speed of the vehicle, being
greater for a slow moving vehicle than for a fast
movingv one.
„
,
If now a vehicle should arrive on the road NS,
relay E will be operated and contacts C’l'l' will
complete a circuit for eiîecting the operation of
relay A as soon as Vcondenser QA is suiliciently
charged. Hence, if a break of suiiìcient length
to permit the striking voltage of the discharge
tube FA to be reached occurs in the traino on the
Y
For convenience of description it will be as
sumed ñrst of all that the cam shaft isstanding
in position 6 giving right of way to the street NS
and that there is no traflic on either street. In
these circumstances a charging circuit is com
pleted over contacts C4 and the adjusting switch
VNS for the condenser QA, but owing to the fact
that neither relay D nor relay E is operated in the
absencey of traiiic assumed and the consequent
absence of closure of road contacts DEW and
DNS, and with contacts d2' therefore open, it is
road EW, relay A will be operated and will ad
vance the cam shaft to positions 4, 5 and E in turn
in the manner previously described‘to give right
of way to the road NS.
In case, however, the traffic on the road EW
should be substantially continuous, that is to say,
there should be no break suiììciently long to per Gi)
mit condenser QA to charge up, the maximum
timing circuit involving the condenser QB comes
into operation. It will be noted that this circuit
cornes into operation as soon as there is a waiting
vehicle on the road NS at which time relay E is 65
operated and locks up over contacts Cl8. The
impossiblefor discharge to take place through the
discharge tube FA when the Vcondenser becomes v charging circuit for condenser QB now extends
charged to the striking voltage. Moreover while over contacts CI2 and the switch MEW by means
. contacts d2 remain open no chargingrcircuit is
of which a, resistance 2l is connected in circuit
70 completed at this time for the condenser QB so»
that solenoid S cannot be operated and the cam
shaft will remain in this position.
through condenser QB, and contacts Cl’l and e2,
which will permit the condenser QB to charge up
only after an interval considerably greater?than
that required for the charging of condenser QA.
Suppose now that a Vehicle arrives on Vthe roadY
EW, relay D willbe energized due to the opera
Right of way will therefore be transferred to the
' tion of a detector DEW and since contacts C6 _ road NS as soon as the condenser QB becomes
w
2,135,471
sufliciently charged to reach the critical value of
discharge tube FB, whereupon the relay B is
energized and through its contact -b| operates
solenoid S, which notches the camshaft into its
nextrfposition.
road relay E or Dilï‘igure 1) will operate and
accordingly both tubes FA and FC will strike and
bring about the operation of their associated re
lays A and C. Relay A completes the circuit of
the solenoid for stepping the cam shaft in the
It will he noted that armatures d3 and e3 when
operated serve to include additional resistances
' YF and YG in their respective amber timing cir
cuits so that when right of Way is being forcibly
10~ removed from a lane thus intercepting a stream of
tra’ñic an extended amber period is given to facili
tate clearing the crossing. 'I'his feature may be
rendered ineffective by closing the amber exten
sion switches ENS, EEW.
3
,
The switches PNS and PEW are so-called arte
rial' switches and when closed ensure that right
of way shall return to the associated street in the
absence of traffic thereon. Their effect is to simu
late the operation of the pads at a time when
20' the street in question is not receiving right of
15v
usual` way, and relay C' operates relay F which
holds during the stepping over the contacts S4
which are closed during the operating period of
the solenoid. When the step is completed, relay
F remains locked over cam contacts C8 which are l0
closed during the amber and initial intervals.
Relay F at armatures f2 and f3 disconnects the
normal initial interval timing circuits and com
pletes a quick-step circuit by way of the low re
sistance YH, so that the controller immediately 15
controller of the type illustrated in Figure 1
steps through the initial interval position into
the vehicle interval' position. Under these cir
cumstances therefore, the timing of the initial
interval is eliminated and when the cam shaft
comes into the vehicle interval position, the cam 20
contacts C8 again open and relay F releases to
restore the circuit to normal.
If, however, a vehicle arriving against the red
signal has to wait either for a gap in the op
posing traftic or for the expiration of the maxi
mum period, the special arrangements described
are not eiîective, since both discharge tubes FA
and FC are in circuit while the condenser QA is
charging and the voltage does not rise above
the striking value of tube FA to reach the strik 30
ing voltage of tube FC, and accordingly relay C
is not operated.
The invention is not limited to systems in
which vehicle detectors are provided in all the
roads forming the intersection and ñnds equal 35
application in systems in which vehicle detectors
are provided in the side roads only though in
to obtain a substantial reduction or in practical
this case of course it can only reduce the initial
effect the elimination of the initial interval in the
interval in the right of way period for the side
roads. In such systems when the minimum right 40
of way period on the main road has expired, it
is clearly undesirable that a vehicle on the side
road which obtains immediate right of way
way by energizing the respective relays E- and D
in cooperation with cam contacts CIS and Cl
' respectively, in all positions except 6 and 3 respec
tively,'though they do not produce any extension
" eii‘ect when the street already has right of way,
Vsuch extension being >produced only by opera
tion of thefproper road pads.
vThe solenoid S is provided with three sets of
contact springs of which Sl and S2‘serve to shunt
condensers QA Yand QB by low resistances YA and
YB respectively. Springs S3 are effective in con
junction with armature h2 to ensure that without
any further operation of the associated detector
right of way shall be returned to the street from
which it has been forcibly removed.
In Figure 2 are shown the modifications to a
40 case where a vehicle actuating a detector in a
traiiic lane which has been denied right of Way
immediately secures transfer of right of way in
its favor. The additional equipment required ac
cording to one embodiment of this invention com
should be provided with an initial as well as a
prises the discharge tube FC, relay C, relay F,
vehicle interval, thereby keeping -the important 45
a ypair of cam contacts C3, resistance YH, and/a
fourth set of springs on the solenoid S. The tube
FC is chosen to have a somewhat higher striking
voltage than the tube FA. The additional cam
main road traffic waiting unnecessarily. Under
these circumstances, therefore, when the mini
mum period for the main road has expired and a
call is made from the side road, the tube FC
contacts C8 are closed in shaft positions l, 2, 4,
will strike and operate relay F so as to ensure
50
that the initial interval on the side road shall
and 5, as will subsequently appear.
A circuit including in series the added dis
charge tube FC' and relay C parallels tube FA and
relay A from resistance 20 to lead 25. By its ar
Cn Ci mature cl relay C is arranged to energize relay F,
which has a lock-in circuit over its armature fl,
and over either cam contacts C8 or over solenoid
springs S4 in parallel therewith. Armatures f2
and f3, in the normal cle-energized position of
relay F, complete the normal timing circuits for
the initial interval on both the EW and NS roads.
When relay F is energized, however, the charging
circuit to timing condenser QA is closed over
either of the armatures f2 and f3 across resist
ance YH which is low in value relative to the nor
mal initial interval charging resistances.
Considering now the operation of the circuit,
if right of Way remains with either road for ap
preciably more than the period of the last vehicle
be eliminated.
It will be appreciated that if a vehicle arrives on
the side road to operate relay D while the charge
on condenser QA is rising between the striking
55
value of tube FA and the striking value of tube
FC, then only tube FA and relay A will operate
and the following side road initial interval will
be of normal full length, just as in the case of the
vehicle arriving before the condenser charge
60
reaches the striking value of tube FA. However,
the dilîerence between the striking voltages of
tubes FA and FC may preferably be quite small,
so that the time to reach the striking value of
tube FC will be only slightly longer than the 65
time to reach that of tube FA and the longer
timer interval may be considered substantially
the same as the vehicle interval of right of Way
timed primarily by tube FA.
FA and FC which do not strike however as their
circuit is open at cam contacts C5 or Clî.
Suppose now a vehicle approaches on the road
Where vehicle detectors are provided in both 70
intersecting roads, a vehicle actuating a detector
on the road having right of way will extend the
right of way period during the vehicle interval
by discharging condenser QA and under these
not possessing right of way, the corresponding
circumstances reduce thecondenser voltage be
extension, the voltage of condenser QA will rise
above the striking values of- the discharge tubes
75
4
2,1 35,47 1
low the striking values of both tubes FA and FC
if it is not already below them. This will delay
the transfer of right of Way to the opposite roadV
in response to a vehicle actuation then occurring
there and until the charge on condenser QA
reaches and operates FA, and thus will cause the
cluding means to accord> right of way to a sec-,
ond laneY for at least a Ininimum period and in
the absence of actuation of said device to main
tain said rightof Way beyond said minimum, a
timing apparatus having a condenser, means in
cluding a high resistance in series with the con
subsequent initial interval in the opposite road
denser for charging said condenser and a gas dis
to be of normal full length.
charge tube having a certain operating voltage
Thus the several objects speciiically brought
10 out above, and others are achieved. It is to be
understood that various modifications in the
structural details or arrangement of the parts, or
changes in the designs herein exempliñed may
be made without departing from the spirit of the
15 invention as defined by the claims.
Having described my invention what I claim
as new and desire to secure by Letters Patent of
the United States is:
i. A traffic control system for interfering traf
20 iic lanes having traffic actuatable means in each
of the lanes, a first set of circuits including sig
nais for according right of Way to one of the
lanes and interrupting right of Way to the other
in parallel with said condenser, the period timed
by said timing apparatus being determined by 10
the charging of said condenser thru said high re
sistance to the operating voltage of said dis
charge tube, one such high resistance con
nectible in the charging means to time a normal
minimum period of right of Way on the lane of
the said traiiic actuatable device, a second such
resistance of different value from the iirstand
connectible in the charging means in place of the
ñrst to time a shorter than normal minimum“
period >of Yright of way onk the said lane, means 20,
operable when actuation of the traiiic actuatable
device in the said one lane occurs before or at
the time of expiration of a minimum right of Way
lane, a'second set of circuits including signals
period on the second lane to connect said one
25 for according right of Way to said other lane and
interrupting right of Way to said one lane, a right
of Way controller connected to said traiiic actu
atable means and to said signalling circuits for
such high resistance in the timing circuit, and
means operable upon actuation after expiration
controlling the latter and including a cyclic
36 switch having two parts to its cycle, and adapted
in one part of its cycle to energize said first set
of signalling circuits and in the other part of its
cycle to energize said second set of signalling
circuits, means forming a part of said controller
35 and operable while said switch is in said other
part of its cycle and when actuation of the trai
iic actuatable means in said one lane occurs be
fore or at the time of expiration of a minimum
period to move said switch to said one part of
its cycle for a normal predetermined minimum
pericd'of time and means operable when actua
tion of said trafñc actuatable means occurs` after
expiration of said minimum period while said
switch is still in said other part of its cycle to
of said minimum right of way period on said sec
ond lane and while right of way is still ac
corded to said second lane to Vconnect said sec
ond resistance in the timing circuit.
'
4i. In a traiiic signal control system for the
intersection of interfering trafiic lanes having
a right of way controller for according and in
terrupting right of way on the said lanes and
a trañic actuatable device in one of the lanes 35
and connected to. said controller to govern op
eration of same, said controller including a tim
ing'arrangement having a condenser, a resist
ance, means for charging said condenser
through said resistance, and means operable in 40
response to a predetermined charge on the con
denser, means functioning upon operation of
said charge responsive means when right of Way
is on said one lane to transfer right of Way to a
move substantially immediately said switch to
second lane, further means functioning upon op 45.
eration of said charge responsive means when
normal predetermined minimum period of time. Y right of Way is on said second lane to transfer
2. In a’ traffic signal control system for the right of Way to the first lane, a second charge
intersection of trafIic lanes, a right of Way con
responsive means operable in response to a pre
troller for according and interrupting right of determined charge higher than the ñrst charge
60 Way on the said lanes, a traffic actuatable device responsive
means, means acting upon actuation
of said tra?lic actuatable device When the right
in one of the lanes and connected to said con
troller tov govern operation of same, a timing of way is on said second lane to connect both of
apparatus forV timing a minimum right of Way said charge responsive means to said condenser,
period
on a second lane, and having a condenser, means functioning only vupon operation of said 55
56
means for charging said condenser, means oper
second charge responsive means to decrease the
able in response to a predetermined charge on resistance in said charging means in the next
the condenser and connected to said condenser period of right of Way on said first lane.
upon actuation of the said actuatable device,
5. In a traffic signal control system for the
intersection of traii‘ic lanes, a right of Way con 60
60 means operable in response to a higher prede
termined charge on the Condenser and connected troller for according and interrupting right of
to said condenser upon actuation of said actuat
Way on the said lanes, a traiiic actuatable’device
said one part of its cycle and for a shorter than
able device, means functioning upon operation
of the first mentioned charge responsive means
65 for providing a normal minimum period of right
of way on the lane of actuation, and further
means functioning upon operation of the second
charge responsive means for providing a shorter
than normal minimum on said lane of actuation.
3. In a trañic signal control system for the in
tersection of traiiic lanes, a right of way con
troller for according’and interrupting right of
Way on the lanes, a traiiic actuatable device in
one of the lanes and connected to said controller
76 to govern operation of same, said controller in
in one of the lanes and connected to said con
troller to govern operation of same, a condenser
electronic tube timing arrangement for timing a 65
minimum right of Way period on a second lane,
and having a condenser, means for charging said
condenser, means when connected to said con
denser operable in response to a predetermined
charge on the condenser for providing a normal 70
minimum period of right of Way on the lane of
the actuatable device, means When connected to
said Condenser operable in response to a higher
predetermined charge on the condenser for pro
viding a shorter than normal minimum period of 75
5
right of Way on said lane of the actuatable de
a second lane for at least a fixed minimum in
vice, and further means operable rupon actuation
vof the traillc actuatable device while right of way
is being denied to the lane Vof said device for
terval and thereafter in absence of actuation in
the first lane, a timing apparatus for determin
ing the extent of each of said intervals and hav
connecting both of said means to said con
ing a condenser, means including a resistance
denser.
'
>
6. In a traffic signal control system for the
intersection of interfering trailic lanes, having
a right of way controller, and a traii‘ic actuatable
10 device in one of the lanes and connected to said
controller to govern transfer of right of way
by said controller between said lanes, a cam
shaft and contacts operating therewith for con
trolling right of way signal circuits and means
for rotating said camshaft forming a part of
said controller, a timing apparatus also forming
a part of said controller to provide minimum
time periods for such right of way and having a
condenser, means for charging said condenser,
29 means operable,.when connected to said con
denser, inresponse to a predetermined charge
on the condenser to operate said camshaft ro
tating means, and to cause the next minimum
period o_fright of way on the lane Yof actuation
to be of a predetermined length, and means op
erable, when connected to said condenser, in re
connectible to said condenser for charging said
condenser, and means operable in response to a
predetermined charge on said condenser for cy
clically advancing said right of way according
means from one interval to the next for the one
lane and then another, means operable when
actuation of the traflic actuatable device in the
said one lane occurs before the time when the
said predetermined charge on the condenser has
been reached in the minimum interval on said l5
second lane to connect said resistance in said
condenser charging means for timing the next
initial interval period of right of way on said
iirst lane, and further means operable when
actuation of the said device occurs after said 20
predetermined charge on the condenser has been
reached in the minimum interval on said sec
ond lane to substitute a substantially lower
value of resistance in said charging means for
said next initial interval.
25
9. In a traino signal control system for the in
spons'e 'to a higher predetermined charge onv the tersection of a plurality of interfering traiîic
condenser to cause said next minimum period lanes, a right of way controller for according and
of right of way on the lane of actuation to bev interrupting right of way, traffic actuatable de
shorter than said predetermined length, and vices in the several lanes for governing the oper 30
further means roperable upon actuation of said
actuatable device for connectingr both of said
charge responsive means to said condenser. _
7. In a trañic signal control system for the
intersection of interfering trahie. lanes, having a
rightr of way controller, and a traffic actuatable
device in one of the lanes and connected to said
controller to govern transfer of right of way by
said controller, means in said controller operat
40 ing in response to actuation of said device for
according right of way to the lane of the actuat
able device for the duration of an initial in
terval plus a variable vvehicle interval and then
to a second lane for at least a fixed minimum in
terval and thereafter in absence of actuation in
the iirst lane, a timing apparatus for determin
ation of said controller, means in said controller 'f ~
for timing a right of way period for each one of
the lanes at a time in turn said period consisting
of a fixed initial interval and a vehicle interval of
at least a predetermined length, means respon/
sive to actuation in a lane having right of way
while said last named means is timing the ve
hicle interval of right of way on such lane for
extending said vehicle interval right of way pe
riod beyond said predetermined length by reset 40
ting said last named means, and means responsive
to actuation of the traino actuatable device in one
lane occurring more than a period of said pre
determined length after any actuation on a sec
ond lane and while right of way is still on said 45
second lane to substantially reduce the next fol
ing the extent of each of said intervals including
lowing initial interval on said one lane when said .
a condenser and means for charging said con
controller next accords right of way to said one
lane.
10. In a traffic signal control system for an in 50
tersection of traffic lanes having a vehicle re
sponsive device in one lane, a right of way con
troller to transfer right of way to said one lane
from a second lane in response to actuation of
said vehicle responsive device in the ñrst lane
and thereafter to retransfer right of way to said
second lane, a condenser and a charging circuit
connected thereto, means including a discharge
tube cooperating with said condenser to time a
minimum period of right of way in said second 60
lane before-transfer to said ñrst lane in response
to actuation of said device, means including a
denser, means operable in response to a predeter
50 mined charge on said condenser for advancing
said right of Way according means from one in
terval to the next for one lane and then another,
means operable when actuation of the traiîic'
actuatable device in the said one lane occurs be
fore or at the time of expiration of said mini
mum interval for said second lane to control
said condenser-charging means to cause said
initial interval period of right of Way‘on said
first lane to be of normal duration, and means
60 operable when actuation of the traffic actuatable
device in the said one lane occurs after expira
tion of said second lane minimum interval to
control said condenser-charging means to pro
vide a shorter than normal initial interval pe
65 riod on said first lane.
8. In a traffic signal control system for the in
tersection of interfering trafiiclanes, having a
right of Way controller, and a trañic actuatable
device in one of the lanes and connected to said
70 controller to govern transfer of right of way by
said controller, means in said controller operat
ing in response to actuation of said device for
according right of Way to the lane of the actuat
able device for the duration of an initial inter
75 val plus a variable vehicle interval and then to
second discharge tube cooperating with said con
denser to time a period of right of way in said
second lane appreciably longer than said mini 65
mum in said second lane, and means responsive to
operation of said second discharge tube upon
such transfer to cause retransfer to said second>
lane sooner than retransfer is caused responsive
to operation only of the first discharge tube upon
such transfer.
11. In a tralñc signal control system for an in
tersection of trañic lanes having vehicle respon
sive devices in the lanes, a right of way controller
to transfer right of Way to one lane from a Second 75
6
¿1:35AM
lane in response to actuation of the vehicle re
sponsive device in the first lane and thereafter
to permit right of way to be retransferred to the
second lane in response to actuation of the ve
hicle responsive device therein, a condenser and a
charging circuit connected thereto, means includ
ing a discharge tube cooperating with said con
denser to time a minimum period of right of way
in said second lane before transfer to said ñrst
10 lane in response to actuation of said device, means
including a second discharge tube cooperating
with said condenser to time a period of right of
Way in said second lane appreciably longer than
said minimum in said second lane, and means
responsive to operation of said second discharge
15
tube upon such transfer to permit right of Way to
be retransferred to the said second lane in re
sponse to actuation therein, sooner than retrans
f‘er Ais permitted responsive to operation only of
20 the ñrst discharge tube upon such transfer.
12. A traiñc control vsystem for interfering
-traffic lanes having trañic actuatable means in
each of the lanes and a right of Way controller
c connected to said tranic actuatable means for
25 governing accord of right of way to the lanes,
said controller including a cyclic switch having
two parts to its cycle and adapted when in one
part to cause accord of right of way to only one
, of the lanes and when in the other to cause ac
cord of right of Way only to the other lane, and
each part of said switch cycle consisting of a ñrst
or initial interval and a latter or vehicle interval,
timing means including a condenser, means in
cluding a resistance for charging said condenser,
means responsive to a predetermined charge on
said condenser to advance said switch from the 5
initial to the vehicle interval of Vone part of its
cycle and in response to an actuation of the traiiic
actuatable means on said other lane occurring
prior to said condenser reaching said predeter
mined charge to advance said switch from said
one part of the cycle to the other part, means re
sponsive to actuation of the trañio actuatableV
means in said one lane when said switch is in the
vehicle interval of said one part of its cycle to
reset the condenser for prolonging the time re
quired to reach such predetermined charge, means
including a relay and operating in the Vehicle
interval of said one part of the switch cycle re
sponsive to a higher predetermined charge on
15
said condenser for operating said relay upon ac 20
tuation of said other lane after said charge 1s
reached, means for maintaining said relay ener
gized until and during said initial interval of said
other part of the switch cycle, and contact means
on said relay operating in the initial interval of 25
said other part of the switch cycle to shunt the
resistance over which the condenser is normally
charged to cause substantially immediate ad
vance of the switch to the vehicle interval of said
30
other part of the switch cycle.
ALFRED PERCY BAILEYRENSHAW.
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