IMPACTS OF SIMPLIFIED TIME-OF-DAY MODELS ON MOBILE SOURCE EMISSION ESTIMATES

In non-attainment areas, the conformity analysis requirements can represent a significant commitment of resources. The traditional approach to conformity analyses can be time-consuming and labor intensive. This paper describes a less daunting approach for performing conformity analyses. Under the simplified approach, the 24-hour equilibrium assignment results are factored to estimate four time periods. The use of a post-assignment approach eliminates the need for trip table factoring and four additional equilibrium assignments for each scenario. A simplified version of the speed models is applied to estimate the time-of-day speeds. The mobile source emission estimates are then computed for each of the four time periods. To determine the impact of these approaches on conformity analyses, both approaches were appied to the Build and to the No-build scenarios. The mobile source emissions were estimated using both sets of data. The analyses focus on the estimated emissions and the differences in the emissions between the two scenarios. The paper compares the models and the resulting mobile source emission estimates.

Language

  • English

Media Info

  • Pagination: 1p

Subject/Index Terms

Filing Info

  • Accession Number: 00711578
  • Record Type: Publication
  • Files: TRIS, TRB, STATEDOT
  • Created Date: Sep 24 1995 12:00AM