March 9, 1999

Document Released for Stakeholder Review and
Comment

Development of Methodology for Estimating VMT
Weighting by Facility Type

Report Number EPA420-P-99-006

The Office of Mobile Sources, Assessment and
Modeling Division announces the release of
"Development of Methodology for Estimating VMT
Weighting by Facility Type" for stakeholder review
and comment.  This document  EPA420-P-99-006 (also
known as M6.SPD.003.)is available at the MOBILE6
section of the OMS Web Site
(http://www.epa.gov/oms/m6.htm)

This draft report summarizes the results of work
conducted for the U.S. Environmental Protection
Agency (EPA) Office of Mobile Sources (OMS)
involving the development and application of
methods to estimate certain aspects of on-road
vehicle activity. Organized around three tasks:

1) Investigating available data sources and
development of a methodology for estimating VMT
allocation by facility type, time of day and
speed;

2) Demonstrating this methodology to a selected
set of cities;

3) Developing an estimate of national VMT
distribution for use by OMS in estimating national
emissions;

this work was designed to develop default
estimates of vehicle miles of travel (VMT) on
different classes of  roadways by speed and time
of day, and to investigate other vehicle
characteristics.

Comments on this report and its proposed use in
MOBILE6 should be sent to the attention of
Dave Brzezinski.  Comments may be submitted
electronically to mobile@epa.gov or by fax to
(734) 214-4939 or by mail to MOBILE6 Review
Comments, USEPA Assessment and Modeling Division,
2000 Traverwood Drive, Ann Arbor, MI 48105. 
Electronic submission of comments is preferred.

In your comments, please note clearly the document
that you are commenting on including the report
title, and the code number listed.  Please be sure
to include your name, address, affiliation, and
any other pertinent information.

This document is being released and posted on
March 9, 1999..  Comments will be accepted until
May 10,  sixty (60)days after date of posting.
EPA will then review and provide a summary of
those comments and how we are responding to them.

Thank you for your continuing interest in the
development of MOBILE6.
                                 
Sincerely,

Emission Inventory Group, Assessment and Modeling
Division US EPA Office of Mobile Sources