Browse Prior Art Database

Vehicular Traffic Control Processes

IP.com Disclosure Number: IPCOM000094567D
Original Publication Date: 1965-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Yardeni, LA: AUTHOR

Abstract

To arrive at the best optimum setting for each signal in a traffic control system, decisions must be made. Such are with regard to the length of the signal cycle, the split, i. e., ratio of red to green, and the offset, i. e., phase difference in seconds between corresponding parts of a cycle with respect to a reference cycle. These variables are usually established by a time-space diagram as in drawing 1. Each set of horizontal dashes corresponds to an intersection. The distance from a reference intersection is represented along the vertical axis. The horizontal axis represents time.

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Vehicular Traffic Control Processes

To arrive at the best optimum setting for each signal in a traffic control system, decisions must be made. Such are with regard to the length of the signal cycle, the split, i. e., ratio of red to green, and the offset, i. e., phase difference in seconds between corresponding parts of a cycle with respect to a reference cycle. These variables are usually established by a time-space diagram as in drawing 1. Each set of horizontal dashes corresponds to an intersection. The distance from a reference intersection is represented along the vertical axis. The horizontal axis represents time.

Segments of the broken lines represent the red interval times in both directions. The blanks between reds are the green, plus amber, interval times. The two pairs of parallel, diagonal lines represent the through-bands in opposite directions. Their slopes represent the speed a vehicle has to maintain in order to stay part of a group, i.e., platoon, of vehicles moving along the major street without signal interference.

Consider a set of intersections along an artery and select the intersection with lowest green ratio as a base. All other intersections can now be considered independently in relation to this base.

Drawing 2 shows the mid-point relations of any other intersection and the base.

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