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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: Administration and Management ⢠Law ⢠Public Transportation ISBN 978-0-309-21334-9 Transportation Research Board 500 Fifth Street, NW Washington, DC 20001
