Skip to contentUnited States Department of Transportation - Federal Highway Administration FHWA Home
Research Home
Fact Sheet
This fact sheet is an archived publication and may contain dated technical, contact, and link information
Publication Number: FHWA-HRT-10-076
Date: September 2010

This Document Has Been Temporarily Removed From This Site

ResearchFHWA
FHWA
United States Department of Transportation - Federal Highway Administration