First Name: | Terry |
---|---|
Last Name: | Parker |
Email Address: | terry.parker@dot.ca.gov |
Affiliation | Caltrans (used to be at CARB) |
Subject | Residential per-HH VMT numbers |
Comment |
During today's hearing, there was a question about whether the 14,000 annual per-Household VMT rates proposed includes differences in household composition (e.g., two-employees, single, etc.) I have information about this that may be helpful. The answer is that - no - this data did not take such demographics into consideration. John Holtzclaw obtained it from the Dept. of Motor Vehicles based on vehicles' two-year odomotor readings (which are required for smog checks). This is an extremely important issue, and needs to be addressed in this effort. FYI - Dr. Holtzclaw did a similar but much larger study than the one referenced in ARB's 1995 report for EDF & NRDC - e..g, for the Location Efficient Mortgage (LEM) program during the late 1990s that included data from all of the San Francisco Bay Area as well as all of Southern California. This study provides much more robust data and - because Dr. Holtzclaw also used some travel demand modeling for the LEM effort - it may provide insights regarding effects of household demographics and composition. (Dr. Holtzclaw can be reached via the California Sierra Club in San Francisco: John.Holtzclaw@sierraclub.org). Also, here is some important information about a study that U.S. EPA is currently conducting to specifically address the need to address and include household composition (and other important demographics, such as income) in estimating vehicle trip and VMT reduction benefits associated with land use mitigation strategies (such as proximity to transit service and the other factors currently being considered in this effort). EPA originally developed the "4Ds" analysis approach for this purpose during the 1990s, and this current effort is updating and upgrading this analysis process (to 6 or 7 "Ds"). For additional information about that effort, suggest contacting: John Thomas, U.S. EPA Development Community and Environment Division, Washington D.C., email: Thomas.John@epamail.epa.gov (As you may be aware, I was the project manager while working for ARB in the 1990s of both the 1995 study "Transportation-Related Land Use Strategies to Minimize Motor Vehicle Emissions" which is the source of the VMT/HH data, as well as the development and incorporation into Urbemis of the Motor Vehicle Mitigation module used to estimate the value of various land use development mitigation strategies.) |
Attachment |
Original File Name:
Date and Time Comment Was Submitted: 2008-12-09 15:19:03 |
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