June 26, 1997

Document Released for Stakeholder Review and Comment

Development of Speed Correction Cycles
document: M6.SPD.001     filename: M6SPD001.PDF

The Office of Mobile Sources, Assessment and Modeling Division,
announces the release of "Development of Speed Correction Cycles" for
stakeholder review and comment.  This document (M6SPD001.PDF) is
available at the MOBILE6 section of the OMS Web Site 
(http://www.epa.gov/omswww/models.htm).

In MOBILE5, speed adjustments were made based on emission results from
the Federal Test Procedure (FTP) and on a number of cycles with
varying average speeds. For MOBILE6 we propose to adjust for
differences in roadway (facility) type as well as speed and non-FTP
effects. EPA has developed new facility-specific inventory cycles,
based on real-world driving studies, to address these purposes. This
report, produced for EPA by Sierra Research, documents the development
of these new cycles.

Comments on this report and its proposed use in MOBILE6 should be sent
to the attention of Connie Radwan.  Comments may be submitted
electronically to mobile@epamail.epa.gov, or by fax to (313)741-7939,
or by mail to MOBILE6 Review Comments, US EPA Assessment and
Modeling Division, 2565 Plymouth Road, 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 June 26, 1997.  Comments
will be accepted for sixty (60) days, ending August 26, 1997.  EPA
will then review and consider all comments received, and will provide
a summary of those comments and how we are responding to them in the
form of a followup document within 30 days after the close of the
comment period September 25, 1997.

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