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These digests are issued in order to increase awareness of research results emanating from projects in the Cooperative Research Programs (CRP). Persons wanting to pursue the project subject matter in greater depth should contact the CRP Staff, Transportation Research Board of the National Academies, 500 Fifth Street, NW, Washington, DC 20001. Subscriber Categories: Law ⢠Safety and Human Factors Transportation Research Board 500 Fifth Street, NW Washington, DC 20001 NON-PROFIT ORG. U.S. POSTAGE PAID PERMIT NO. 88 COLUMBIA, MD
