![]() ![]() ![]() 40 CFR Parts 51 and 93.Ĭalifornia Air Resources Board (1996) Methodology for estimating emissions from on-road motor vehicles, Volume II: EMFAC7G. We also examine ways to think about constructing mobile source emission inventories.ĬFR (Code of Federal Regulations) 40 (1997) Transportation Conformity Rule Amendments: Flexibility and Streamlining Final Rule. We use the results to assert that deciding between a trip-based or link-based conformity modeling process involves more than the technical difficulty of changesto the models or the potential political ramifications, it involves assessing which method will provide the most accurate estimates of regional motor vehicle emissions. The results of our study indicate that trip-based VMT-speed distributions produce consistently lower emissions estimates than the link-based distributions. Using the Sacramento region we examine the effects on mobile source emissions inventories when speed-VMT distributions are constructed using the trip and link-based philosophies. This paper explores the "trip versus link debate," which stems from the fact that the standard travel demand models used by most metropolitan planning organizations are primarily link oriented, while the air quality models have been primarily trip oriented. Consequently, every change to either modeling process is undertaken with great scrutiny by the regional governments, who have to use the models for demonstrating conformity. Transportation conformity is a US regulatory process that requires that transportation modeling be integrated with air quality modeling. ![]()
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