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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 of Sciences, Engineering, and Medicine, 500 Fifth Street, NW, Washington, DC 20001. Transportation Research Board 500 Fifth Street, NW Washington, DC 20001 Subscriber Categories: Aviation â¢ Law NON-PROFIT ORG. U.S. POSTAGE PAID COLUMBIA, MD PERMIT NO. 88