Browse Prior Art Database

TRAFFIC LIGHT CONTROL WITH FLEX PAGING

IP.com Disclosure Number: IPCOM000008742D
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2002-Jul-09
Document File: 1 page(s) / 58K

Publishing Venue

Motorola

Related People

Anselm Sequeira: AUTHOR

Abstract

In all major cities there is a need for centralized timing of traffic lights. When traffic lights on a major thoroughfare change in a timed sequence a smooth flow of traffic can be achieved.

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MOTOROLA Technical Developments

TRAFFIC LIGHT CONTROL WITH FLEXTM PAGING

by Anselm Sequeira

  In all major cities there is a need for centralized timing of traffic lights. When traffic lights on a major thoroughfare change in a timed sequence a smooth flow of traffic can be achieved.

  Consider two traffic lights separated by a distance of one mile with a speed limit of 40 m.p.h. A vehicle travelling at the speed limit takes 90 seconds to travel a mile. If we choose a preferred direction of travel (say towards downtown), the trafftc light closer to downtown should change state 90 seconds later than the previous traffic light. This allows vehicles travelling towards downtown to avoid stopping for red lights.

  Existing traffic control systems use hard-wired control signals between traffic lights and a central controller. With newer technology traffic light control can be implemented using widely available paging infrastructure. This eliminates the cost of wiring trafftc lights into a network. Newly installed traflic lights can be immediately synchronized to the rest of the system. Traffic lights can be instantly updated with new profiles to accommodate changing road conditions.

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1 mile = 90 seconds @ 40mph

The implementation of such a controller has the 2. A common source of timing for all the con- following requirements: trollers in a region.

1. A state table for each controller defining the 3. An individually programmable time offset into duration of...