Determining Traffic-Flow Characteristics by Definition for Application in ITS

This paper presents a method called ‘n-t’ that is meant to compute traffic flow characteristics for intelligent transportation systems (ITS) like flow, density, and space mean speed (SMS). A method for such computations, it is explained, should have the following characteristics: 1) it should be completely ITS compatible; 2) it should be accurate; 3) it should preserve relationships between flow, density, and SMS; and, 4) it should involve only one type of sensor to determine the traffic flow factors. The author provides an outline of the n-t method, and also presents data and interpretation from empirical tests using the approach. Other methods are tested as well, namely the ‘x-t’ method and the Highway Capacity Manual (HCM) method. It is found that the n-t method is best for satisfying the criteria outlined above.


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  • Accession Number: 01052193
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Files: BTRIS, TRIS
  • Created Date: Jun 18 2007 6:13PM