GB1009445A - Improvements in or relating to road traffic signalling systems - Google Patents
Improvements in or relating to road traffic signalling systemsInfo
- Publication number
- GB1009445A GB1009445A GB823061A GB823061A GB1009445A GB 1009445 A GB1009445 A GB 1009445A GB 823061 A GB823061 A GB 823061A GB 823061 A GB823061 A GB 823061A GB 1009445 A GB1009445 A GB 1009445A
- Authority
- GB
- United Kingdom
- Prior art keywords
- detectors
- queue
- traffic
- detector
- green
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
- G08G1/08—Controlling traffic signals according to detected number or speed of vehicles
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Traffic Control Systems (AREA)
Abstract
1,009,445. Road traffic signalling systems. AUTOMATIC TELEPHONE & ELECTRIC CO. Ltd. Feb. 22, 1962 [March 7, 1961], No. 8230/61. Heading G4Q. A road traffic signalling system includes provision for detecting the formation of a queue at a traffic-light controlled-junction and for varying the " green period " of the lights and preventing the entrance of further traffic from side roads into the main road in dependence on the length of the queue. Detectors AN, AS, BE, BW, Fig. 2, are the usual traffic detectors and they control the usual signals ANS1, ANS2, ASS1, ASS2, BES1, BES2, BWS1, BWS2. Additional detectors AB1, AC1 are provided for north-bound traffic, detectors AN, AB1 measuring the length of the queue existing at the beginning of a green period on phase A, while detector AC1 determines when the queue length is such as to cause saturation of the phase. The operation is based on the fact that if a queue has formed, traffic will travel over the first detector, and possibly the second, depending on the queue length, at a very low speed, say 5 m.p.h. The detectors AN, AB1, AC1 are shown in Fig. 3. At the beginning of the green phase a start signal ST is applied to gate IG and connects detector AN to a speed discriminator SD (set for speeds of 5 m.p.h. or less) for a time of at least 5 seconds determined by a timer in I.G. Operation of the detector by a slow moving vehicle (less than 5 m.p.h.) indicating that a queue has formed will trigger SD and a register A, the output from which (1) provides a signal to gate COA to disconnect SD from AN and connect SD to detector AB1 via COB, COA; (2) provides a path between SD and register B via A; (3) provides a reset signal to IG over RS2; (4) provides a signal to controller CON to increase the maximum " green " period from a low to a medium value. The reset signal to gate IG maintains the detectors energized for a further period and if a queue has formed beyond AB1, a vehicle travelling slowly over AB1 will similarly cause an output from register B which (1) disconnects detector AB1 and connects detector AC1 to SD; (2) completes a path between SD and register C via A, B; (3) provides a reset signal to IG over RS 2 ; (4) provides a signal to the controller CON to increase the maximum green period from a " medium " to a " high " value. The detectors AN, AB1, AC1 will still be energized over IG. If the queue extends beyond AC1, the first vehicle over AC1 will be moving very slowly thereby triggering SD, the consequential output from register C causing controller CON to transmit a signal to any adjacent controlled side rods to reduce the traffic flow from these roads by shortening the " green " periods in their directions and lighting indicators, e.g. " No left turn ", or divert the traffic into an alternative route. If no vehicle passes over a detector to operate SD while IG is open then IG will close and de-energize the detectors for the rest of the " green " period. Detectors responding to the presence rather than the passage of a vehicle may alternatively be used.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB823061A GB1009445A (en) | 1961-03-07 | 1961-03-07 | Improvements in or relating to road traffic signalling systems |
FR890199A FR1316959A (en) | 1961-03-07 | 1962-03-06 | Traffic signaling device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB823061A GB1009445A (en) | 1961-03-07 | 1961-03-07 | Improvements in or relating to road traffic signalling systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1009445A true GB1009445A (en) | 1965-11-10 |
Family
ID=9848462
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB823061A Expired GB1009445A (en) | 1961-03-07 | 1961-03-07 | Improvements in or relating to road traffic signalling systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1009445A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2320122A (en) * | 1996-12-07 | 1998-06-10 | Stephen John Adams | A rapid flow traffic system |
CN109285362A (en) * | 2018-12-07 | 2019-01-29 | 北京工业大学 | The anti-overflow dynamic control method in intersection based on priority rule |
-
1961
- 1961-03-07 GB GB823061A patent/GB1009445A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2320122A (en) * | 1996-12-07 | 1998-06-10 | Stephen John Adams | A rapid flow traffic system |
CN109285362A (en) * | 2018-12-07 | 2019-01-29 | 北京工业大学 | The anti-overflow dynamic control method in intersection based on priority rule |
CN109285362B (en) * | 2018-12-07 | 2021-03-02 | 北京工业大学 | Intersection anti-overflow dynamic control method based on priority rule |
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