Патент USA US2135471код для вставки
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.