Simulation models, such as the HIWAY model, which endeavor to predict changes in CO concentration caused by changes in a traffic facility such as a freeway, assume that the line source has a constant emission profile. This assumption is inadequate in interrupted flow conditions such as those caused by traffic signalization. This situation can be rectified by integration of hte HIWAY model with the UTCS-1 model, a microscopic traffic simulation model which can provide a profile of the emissions of individual vehicles at given speeds and accelerations along various points of a network. A simulation using both models of a section of Wisconsin Avenue in Washington, D.C., shows that emissions fall off rapidly at midblock, (thus confirming the effects of idling on emissions) and that pollution levels at a given distance from the street will vary in a manner similar to the emissions. This work demonstrates that the emission profile is necessary for the prediction of pollution levels in urban areas and that the UTCS-1 model is a useful tool for generating such profiles under a wide veriety of conditions.

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 74-76
  • Monograph Title: Environmental and conservation concerns in transportation: energy, noise, and air quality
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00183521
  • Record Type: Publication
  • ISBN: 0309026776
  • Report/Paper Numbers: HS-024 285
  • Files: TRIS, TRB
  • Created Date: Dec 12 1978 12:00AM