GB1217693A - A traffic signal control system - Google Patents
A traffic signal control systemInfo
- Publication number
- GB1217693A GB1217693A GB5974/68A GB597468A GB1217693A GB 1217693 A GB1217693 A GB 1217693A GB 5974/68 A GB5974/68 A GB 5974/68A GB 597468 A GB597468 A GB 597468A GB 1217693 A GB1217693 A GB 1217693A
- Authority
- GB
- United Kingdom
- Prior art keywords
- street
- signal
- major
- green
- minor
- 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
1,217,693. Road signals for controlling traffic. TATEISI ELECTRONICS CO. 7 Feb., 1968 [14 Feb., 1967], No. 5974/68. Heading G4Q. In a system for controlling traffic signals at an intersection of a plurality of streets the number of vehicles passing a vehicle detector 42, 46; 44, 48 in a predetermined first period of time is counted and traffic volumes are obtained by counting the number of vehicles passing the detector in a predetermined second period of time substantially longer than the first period of time and means is operable in response to a predetermined number of vehicles on the street to which a red signal is given being detected in the predetermined first period of time such that a green signal is given to allow the traffic to pass to the intersection. As shown major street detectors 42, 46 and minor street detectors 44, 48 feed signal generator and pulse counters 49, 50 which supply outputs L1, L2 indicating the volume of traffic on the major and minor street to a comparing circuit 51 which gives an output if the volume on the major street is greater than that on the minor street. Also outputs LM and LC are given when the vehicles counted on the major or minor street reach the predetermined number. The outputs LM, LC are fed to bi-stable circuits F1, F2 via INHIBIT logic elements IN1, IN2 depending on the condition of the AND gates A1, A2, A3 and NOT gates N1, N2. The output from the bi-stables F1, F2 are passed via OR gate OR2 to a controller 52 which controls the operation of the traffic lights at the intersection. The signals on lines LY, L1G and L2G are "1" when the yellow; major green, minor red; and minor green, major red signals are illuminated. If the predetermined number of vehicles is detected on the major or minor street when these are giving a green signal although the signals LM, LC cause the bi-stable F1 or F2 to be set to give a "1" output as the lines L2G, L1G are "0" this does not affect the input to the OR gate OR2 and the signals on the major or minor street remain unchanged at green. However if the major or minor street signal is red on occurrence of the predetermined number of vehicles waiting on the major or minor street than the signal changes to green. The change in the traffic signal may be effected the instant signal S becomes "1" or a short period of time after by including a delay element between OR gate OR2 and the controller 52. Alternatively the change in the traffic signal may take place upon termination of the initial portion of the green signal or by shortening the unit extension to be added, for every one vehicle detected, to the initial portion of the green signal. If a signal LM and LC occur together but the traffic volume on the major street is smaller than that on the minor street the signal LM is prevented from setting bi-stable F1 whereas signal LC passes to set bi-stable F2. If the green signal is displayed to the major street then this is changed to red and green is given to the minor street. Alternatively if the major street is red then it stays at red and the minor street stays at green. Similarly if signals LM and LC are both received together and the traffic volume is greater on the major street than the minor street or if the major street priority command is given on line LP2 the signal LM controls the bi-stable F1 and controller 52 to give a green signal to the major street. The yellow signal supplies reset inputs to the bi-stables F1, F2. The logic elements A, IN, N, OR and F may include diodes and/or transistors. The system may be used in a multiphase control system. Four signalling devices (32, 34, 36 and 38, Fig. 1, not shown), are located at the intersection and each signalling device has a green, yellow and red lamp arranged from left to right.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP42009472A JPS5011240B1 (en) | 1967-02-14 | 1967-02-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1217693A true GB1217693A (en) | 1970-12-31 |
Family
ID=11721191
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5974/68A Expired GB1217693A (en) | 1967-02-14 | 1968-02-07 | A traffic signal control system |
Country Status (5)
Country | Link |
---|---|
US (1) | US3602880A (en) |
JP (1) | JPS5011240B1 (en) |
DE (1) | DE1616225B1 (en) |
FR (1) | FR1553506A (en) |
GB (1) | GB1217693A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2320122A (en) * | 1996-12-07 | 1998-06-10 | Stephen John Adams | A rapid flow traffic system |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4370718A (en) * | 1979-02-06 | 1983-01-25 | Chasek Norman E | Responsive traffic light control system and method based on conservation of aggregate momentum |
KR101246280B1 (en) * | 2008-09-26 | 2013-03-22 | 무라다기카이가부시끼가이샤 | Guided vehicle system |
US11043120B2 (en) * | 2017-06-28 | 2021-06-22 | Sumitomo Electric Industries, Ltd. | Preferential control cancel device, cancel method, and computer program |
CN114093161B (en) * | 2021-10-09 | 2023-04-07 | 长安大学 | Pedestrian crossing safety evaluation method and signal lamp setting method |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2213409A (en) * | 1936-05-07 | 1940-09-03 | Nachod & United States Signal | Traffic control system |
DE889723C (en) * | 1950-06-13 | 1953-09-14 | Kurt Dipl-Ing Weise | Control device for vehicle-controlled traffic control systems with electron tubes in toggle circuit |
US3035246A (en) * | 1954-06-08 | 1962-05-15 | Gen Railway Signal Co | Highway signalling system |
-
1967
- 1967-02-14 JP JP42009472A patent/JPS5011240B1/ja active Pending
-
1968
- 1968-02-07 GB GB5974/68A patent/GB1217693A/en not_active Expired
- 1968-02-08 US US704033A patent/US3602880A/en not_active Expired - Lifetime
- 1968-02-10 DE DE1968T0035852 patent/DE1616225B1/en not_active Withdrawn
- 1968-02-12 FR FR1553506D patent/FR1553506A/fr not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2320122A (en) * | 1996-12-07 | 1998-06-10 | Stephen John Adams | A rapid flow traffic system |
Also Published As
Publication number | Publication date |
---|---|
DE1616225B1 (en) | 1971-11-04 |
FR1553506A (en) | 1969-01-10 |
US3602880A (en) | 1971-08-31 |
JPS5011240B1 (en) | 1975-04-28 |
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