Browse Prior Art Database

Interrupt for Use in an Automatic Traffic Control

IP.com Disclosure Number: IPCOM000096172D
Original Publication Date: 1963-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Gaffney, JE: AUTHOR [+2]

Abstract

The length of any portion of a traffic control cycle is extended under computer control in this system. Normal operation of traffic stop light 1 proceeds under control of timing and drive mechanism 2. This actuates switches 3, 5 and 5 through cams 7, 8 and 9, respectively. Switch 10 is normally closed and the preset ratio of Red, Amber and Green prevails. Where it is desired to change this ratio, switch 10 is opened during that portion of the cycle which is to be increased.

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Interrupt for Use in an Automatic Traffic Control

The length of any portion of a traffic control cycle is extended under computer control in this system. Normal operation of traffic stop light 1 proceeds under control of timing and drive mechanism 2. This actuates switches 3, 5 and 5 through cams 7, 8 and 9, respectively. Switch 10 is normally closed and the preset ratio of Red, Amber and Green prevails. Where it is desired to change this ratio, switch 10 is opened during that portion of the cycle which is to be increased.

The operation of switch 10 is under the control of computer 11. Data on existing traffic conditions is fed to computer 11 and the optimum on-off ratio for each traffic control light is determined. As a result of this calculation, the optimum cycle for light 1 is determined. Switch 10 is actuated in accordance with the difference between the length of the preset cycle and the calculated length to interrupt the drive current to cycle control 2 for a length of time equal to the difference between the preset and desired lengths of time.

In some applications it is desirable to provide devices by which computer 11 determines the status of light 1. To this end, monitoring lines 12, 13 and 14 are provided.

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