Examination of fundamental traffic characteristics and implications to ITS
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Examination of fundamental traffic characteristics and implications to ITS

Filetype[PDF-127.92 KB]


English
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  • Alternative Title:
    1998 Transportation Conference Proceedings
  • Creators:
  • Subject/TRT Terms:
  • Resource Type:
    Proceedings
  • Geographical Coverage:
    St. Louis (Missouri)
  • Corporate Publisher:
    United States. Federal Highway Administration
  • NTL Classification:
    NTL-OPERATIONS AND TRAFFIC CONTROLS-Traffic Flow;NTL-OPERATIONS AND TRAFFIC CONTROLS-Congestion;NTL-INTELLIGENT TRANSPORTATION SYSTEMS-INTELLIGENT TRANSPORTATION SYSTEMS;
  • Abstract:
    The purpose of this paper is to study and analyze the essential traffic characteristics of a 5.4-mile stretch of I-64-40 located within the St. Louis metropolitan area. The freeway experiences heavy congestion during peak periods attributed to factors such as exceedingly high traffic volume, conflicting merging and diverging movements, multiple weaving areas, and overall poor geometric design. The freeway volume, speed, and density data were collected on various locations within the study area and the data was translated into a series of graphics including, a speed-volume-time of day chart, a speed-volume chart, a volume-density chart, and a speed-density chart. The numerical result indicated that the capacity, free flow speeds, and critical speeds varied for different lanes. However, it was observed that the critical densities were relatively similar for all lanes at the same location. This indicates that density may be a rather important and more reliable measure than volume and speed in the determination of freeway capacity. This study provides a better understanding of the freeway dynamics. In addition, it forms a comprehensive database for the development and implementation of congestion management techniques utilizing Intelligent Transportation System (ITS). Key words: freeway dynamics, u-q curve, q-k curve, u-k curve, critical density, ITS application.
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