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Abstract:This report includes parts of a general study of the various aspects of vehicular density for use in the control of freeway traffic. Density is herein considered singly as a possible control element of a freeway operational system. This study provides information which may be useful for freeway control methods. Electronic equipment manufacturers should be encouraged by this study to develop density sensing systems. The scope of this report specifically involves principal study areas described as follows: 1. The principal features of existing methods used to measure or estimate density are reviewed. 2. Results of aerial photography studies of the Gulf Freeway in Houston, Texas, are utilized to show how density may be related to volume as well as to certain geometric features of the freeway facility. 3. A field study method is described which yields continuous values of vehicular concentration on certain sections of a freeway.
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