Road traffic control system with alternating nonstop traffic flow

• US 5,278,554 A
• Filed: 04/20/1992
• Issued: 01/11/1994
• Est. Priority Date: 04/05/1991
• Status: Expired due to Fees

• Current Assignee: Louis L. Marton
• Original Assignee: Louis L. Marton
• Inventors: Marton, Louis L.
• Primary Examiner(s): Crosland, Donnie L.
• Application Number:
  US07/870,100
• Time in Patent Office: 631 Days
• Field of Search: 340/910, 340/930, 340/934, 340/936, 340/933, 340/901, 340/917, 340/905, 340/933, 340/909, 340/911, 364/436-438, 180/167-170
• US Class Current: 340/910
• CPC Class Codes: G08G 1/081 Plural intersections under common control
• CPC Class Codes: G08G 1/096725 where the received information generates an automatic action on the vehicle control
• CPC Class Codes: G08G 1/09675 where a selection from the received information takes place in the vehicle
• CPC Class Codes: G08G 1/096775 where the origin of the information is a central station

Abstract

The central version of the road traffic control system maintains nonstop flow of traffic on selected lanes of fastroads (1A, 1B, 1C, 4A, 4B, 4C, 31A, 31B, 31C, 32A, 32B, 32C) all the time by grouping the vehicles in closed columns in moving travel zones alternating with empty zones, marked by fixtures (6) emitting zone marker signals controlled by central processor (7). Columns of vehicles are grouped in travel zones (21A, 21B, 33A, 33B) alternating with empty (vacate) zones (211, 331), and are laid out in a centrally controlled grid pattern of fastroads (1A, 1B, 4A, 4B, 31A, 31B, 32A, 32B). The control system guides the moving travel zones through the empty zones of the cross roads without stopping. In local version having light traffic, stopping is reduced and quasi-nonstop traffic flow is introduced on locally controlled crossings (41, 42) by sensor ( 45A, 45B, 46A, 64B, 46C) controlled traffic lights operated by local processor (47).

Claims

1. A method for controlling city traffic with reduced stopping in at least one nonstop lane of at least one designated road, comprising the steps of:

(A) establishing a centrally controlled signal progression system along said road by

(A1) installing a plurality of signal emitting fixtures disposed along said road, each adapted to alternately emit one of three signals,

(A2) installing a plurality of local control means, each one interconnected with one of said fixtures, for switching said fixtures to create three strings of said three signals following one another along said road;

a first string comprising a first number of consecutive fixtures emitting the first one of said three signals, a second string comprising a second number of consecutive fixtures emitting the second one of said three signals, and a third string comprising a third number of consecutive fixtures emitting the third one of said three signals, said three string of signals marking three distinct zones, a travel zone, a vacate zone, and a transition zone following one another along said road in repeated sequences,

(A3) installing central control means for generating control signals in cycles forwarded through interconnections to each said local control means for prompting them to perform step by step switching operations in each cycle in unison inducing a forward step in each said local control means for progressing the position of each said fixture in said signal progression system by one step in each cycle, causing each signal to jump from each said fixture to the next in each step thereby effecting each zone to move in increments with the progression of said signals,

(A4) designating said travel zones for vehicular traffic steadily moving exclusively within said travel zones in said nonstop lane including intersections,

(B) permitting the entry of vehicles into said nonstop lane only in periods when the next signal emitting fixture in forward direction prompted by said local control means to emit the signal of said travel zones whereby preventing the development of congestion and maintaining a steady flow on said nonstop lane.

2. A method for controlling city traffic as claimed in claim 1 including the additional step of permanently authorizing the presence of vehicles only in said travel zones of said nonstop lane, temporarily admitting vehicles in said transition zones and vacate zones within the length of a fastblock said fastblock being the distance between two subsequent nonstop intersections, excluding the area of the intersections, and obliging all vehicles outside of said travel zones to leave said nonstop lane before said local control means starts switching on said fixtures in said fastblock to emit the signal of said travel zone.

3. A method for controlling city traffic as claimed in claim 1 including the additional step of controlling the traffic flow on a multiplicity of roads forming a grid, said vehicular traffic travelling in said travel zones with nonstop speed passing every nonstop intersection through said vacate zones of a cross traffic with safety provided by said transition zones.

4. A method for controlling city traffic as claimed in claim 2 including the additional step of installing the same number of fixtures in every fastblock, each said fixture interconnected with one of said local control means operated by said central control means with the same frequency of switching cycles throughout said grid under central control thereby establishing an average speed of the progression of said zones in every fastblock, said nonstop speed, proportionally to the length of each said fastblock.

5. A method for controlling city traffic as claimed in claim 1 including the additional step of requiring a leading vehicle in said nonstop lane of said travel zone to keep up with the progression of the first signal of said travel zone, and each following vehicle to keep minimum safe clearance from the preceding vehicle whereby said travel zone can be filled up to capacity maximizing the traffic flow.

6. A method for controlling city traffic as claimed in claim 1 including the additional step of providing landing zones for vehicles leaving the nonstop lane for performing local parking and entering movements without hindering said traffic flow, during a period when said signal emitting fixtures, prompted by said local control means, emit the signal of said vacate zone in the given fastblock, and said nonstop lane carries no traffic.

7. A method for controlling city traffic as claimed in claim 6 including the additional step of parking a vehicle parallel to a curb using said nonstop lane for performing the following steps:

(1) passing a selected parking space;

(2) exiting said nonstop lane and entering into the closest landing zone;

(3) waiting for the period when said signal emitting fixtures prompted by said local control means emit the signal of said vacate zone in the given fastblock;

(4) backing into said parking space while the signal of said vacate zone is emitted by said fixtures.

8. A method for controlling city traffic as claimed in claim 1 including the additional step of providing a designated opening in a two way traffic system at midway between two subsequent nonstop intersections for performing nonstop left turn and U-turn without hindering said traffic flow while said signal emitting fixtures prompted by said local control means emit the signal of said vacate zone for the opposing traffic in the given fastblock.

9. A method for controlling city traffic as claimed in claim 8 including the additional step of performing a nonstop left turn in two way traffic system on a road having no left turn lane by using the nonstop lane of said opposing traffic as a temporary left turn lane without hindering said traffic flow while said signal emitting fixtures prompted by said local control means emit the signal of said vacate zone for said opposing traffic in the given fastblock.

10. A method for controlling city traffic as claimed in claim 1 including the additional step of installing means for inserting a coded blinking into said emitted signals of said travel zone for encouraging the drivers to follow the preceding vehicle with the minimum safe clearance when vehicles waiting for entry at on ramps, and for marking the last signal in said travel zone with a different code.

11. A method for controlling city traffic as claimed in claim 1 including the additional step of arranging the length of said zones in two way traffic that the length of said travel zone plus said transition zone is substantially equal to the length of said fastblock, and the length of said vacate zone is substantially equal to the length of said fastblock plus the sum of the width of two crossing fastroads enclosing said fastblock, and the minimum length of said transition zone is equal to the safe braking distance at said nonstop speed at existing road conditions.

12. A method for controlling city traffic as claimed in claim 11 including the additional step of arranging a starting position of said zones in a selected point in time to form a square having clockwise orientation in their loop in right hand driving traffic systems, said squares alternating in a checkerboard pattern in said grid under central control.

13. A method for controlling city traffic as claimed in claim 1 including the additional step of arranging the length of said zones in one way traffic that the length of said travel zone plus said transition zone is substantially equal to the sum of the length of said two fastblocks plus the width of the crossing fastroad separating said two fastblocks, and the length of said vacate zone is substantially equal to the sum of the length of said two fastblocks plus the width of said crossing fastroad separating said two fastblocks, plus the sum of the width of the two crossing fastroads enclosing said two fastblocks, and the minimum length of said transition zone is equal to the safe braking distance at said nonstop speed at existing road conditions.

14. A method for controlling city traffic as claimed in claim 13 including the additional step of arranging a starting position of said travel zones in a selected point in time to form two alternating zigzag patterns in said grid leaning diagonally in southwest-northeast direction where said first pattern has southwest orientation, said second pattern has northeast orientation.

15. A method for controlling city traffic as claimed in claim 1 including the additional step of disposing sensor means along said at least one designated road having interconnections to said central control means, for generating input signals when triggered by passing vehicles and environmental conditions, prompting said central control means for surveying the traffic congestion, weather and road surface conditions in said grid and for adapting a system speed accordingly by adjusting a frequency of the switching operations for establishing and maintaining the optimum safe velocity for the controlled roads under the prevailing driving conditions whereby operating said system safely and a most advantageously.

16. A method for controlling city traffic as claimed in claim 1 including the additional step of installing signal emitter means in said fixtures for emitting a set of signals carried by narrow beams of the electromagnetic spectrum and admitting at least one automated vehicle in said travel zone equipped with control receiver means for receiving and processing said signals received from said signal emitting fixtures, said control receiver interconnected with automatic control means adapted for controlling the velocity and relative position of said automated vehicle in said travel zone by adjusting its cruise control device and its brake control without the driver'"'"'s intervention.

17. A method for controlling city traffic as claimed in claim 16 including the additional step of installing radar type distance control means for emitting pulses and receiving echoes from the preceding vehicle and providing control signal through interconnections for said automatic control means for controlling the velocity and relative position of said automated vehicle in said travel zone by adjusting its cruise control device and its brake control for maintaining a desired proper clearance on the front of said automated vehicle without the driver'"'"'s intervention.

18. In a road traffic control system of the type having local control means for controlling vehicular traffic at a crossing of a first street and a second street and signal lights arranged at said crossing, facing each approach, adapted for emitting alternately red, green, and yellow light, controlled by said local control means responding to sensor input, comprising:

first, second, and third sensor means adapted for generating input signal each transmitted through an interconnection to said local control means via an amplifier when triggered by a passing vehicle, said first sensor means being accommodated on said first street, said second sensor means on said second street, one on each approach along said streets before said crossing, and said third sensor means being accommodated within said crossing,

said first sensor means being adapted to generate input signal amplified by its amplifier, transmitted through said interconnection to said local control means when triggered by the passing of a first vehicle on said first street prompting said local control means to switch said signal lights to green for said first street,

interlock circuit means connected to said local control means and adapted to be activated by said first sensor means via its amplifier, for preventing a change in said signal light output until said third sensor means within said crossing being triggered by the passing of said first vehicle through said crossing, releasing said interlock circuit means,

said second sensor means adapted to generate input signal amplified by its amplifier, transmitted to said local control means through said interconnection when triggered by the passing of a second vehicle on said second street prompting said local control means to switch said signal lights to green for said second street,

interlock circuit means connected to said local control means and adapted to be activated by said second sensor means via its amplifier, for preventing a change in said signal light output until said third sensor means within said crossing being triggered by the passing of said second vehicle through said crossing, releasing said interlock circuit means,

timer means for executing an operating period after each switching of the orientation of said signal lights from one street to the other for releasing said interlock circuit means after a preset time delay elapsed whereby unnecessary stopping of said vehicles being avoided while uninterrupted traffic generally maintained.