The document is concerned with the benefits of various systems of co-ordinating traffic signals. Five different control schemes have been tested since the system became operative in November 1967. The fifth system, called Plident, did not incorporate any formal linking. Platoons of traffic on main roads were identified and their arrival times at downstream signals were predicted. Green times were adjusted to suit the length of platoons, up to possible 3-min. maximums. Substantial improvements in journey times were obtained when the Combination method and Transyt were compared with the system of linked and isolated vehicle-actuated signals which existed in Glasgow in 1967. Neither Flexiprog nor Equisat appeared to give a measurable improvement over the basic fixed-time linked system, Plident, the most elaborate and flexible of the systems tested, produced the longest average journey times recorded in the experiment. Details of the operation of Plident are given, with a discussion of future work and policies for implementing area traffic control. (Author)


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    The Glasgow experiment : PLIDENT and after

    Holroyd, Joyce | TIBKAT | 1971


    Equipment in Glasgow experiment

    Hillier, J.A. | Engineering Index Backfile | 1968


    Glasgow experiment -- Schemes and equipment

    Hillier, J.A. | Engineering Index Backfile | 1967