Title: UPGRADING THE ART OF TRAFFIC DATA COLLECTION
Abstract: The author gives a brief history of census techniques and describes work undertaken since 1976 on the testing and development of automatic vehicle classification systems. At present, manual surveys are carried out by local authorities and the Department of Transport; there is no cross-referencing between national and local surveys. As the use of results from manual surveys can lead to a 30 per cent error in flow estimates, a new microprocessor-based automatic classification system is being developed at TRRL to produce data on vehicle flow, time headways, speed, classification, and overall length for four lanes of traffic with up to 2500 vehicles per hour in each lane. An accuracy of 90 per cent can be achieved on rural roads. Using this equipment a two-part framework is to be set up with a core of some 120 continuously monitored sites and a rotating census of some 11500 points within a five year cycle. Results from the core census will be used with those from a single day count at some 3000 points to produce national traffic estimates. Research into methods of improving accuracy by better sensor design is outlined. (TRRL)
Publication Year: 1982
Publication Date: 1982-05-27
Language: en
Type: article
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