A NEW METHOD OF ESTIMATING DAILY TRAFFIC FLOWS AND ITS USE IN VERIFYING PREDICTED FLOWS IN WHITSTABLE, KENT
Recently there was a public outcry over a proposal to alleviate traffic problems in Whistable by building a relief road. Members of the Whitstable Society, a local amenity group, decided to measure current traffic flows at nine key points in the town and to try to determine whether the flows predicted for 1981 by the Kent County Council would be likely to materialise. Because resources were limited, it was necessary to devise a new sampling method which would require a total of not more than about 50 man hours spent counting, but which would give reasonably accurate estimates of the daily flow totals at least for the more intensively sampled sites. This was acheived by separating the sites into a number of groups, in each of which the pattern of flow variation through the hours of the day was expected to be roughly the same for each site. The variation pattern was estimated for each group via an iterative method based on a maximum likelihood assumption, from the various hourly flow samples collected at the various sites within the group. this paper describes the methods used inestimating the procedure and the results obtained. It is concluded that present flows differ appreciably in some cases from the expected values interpolated between the County Council base year assignment(1968) and design year assignment (1981).
- Presented at PTRC Summer Annual Meeting, Warwick University, England, 8-12 July 1974.
Planning and Transport Res and Computation Co, Ltd40 Grosvenor Gardens
London SW1, England
- Wright, C
- Publication Date: 1974-7
- Features: Figures; Tables;
- Pagination: 16 p.
- TRT Terms: City planning; Forecasting; Measurement; Methodology; Sampling; Traffic flow; Traffic surveys
- Subject Areas: Highways; Operations and Traffic Management;
- Accession Number: 00262803
- Record Type: Publication
- Files: TRIS
- Created Date: Nov 12 1974 12:00AM