TRANSPORTATION RESEARCH RECORD No. 1377 Pavement Design, Management, and Performance Nondestructive Deflection Testing and Backcalculation for Pavements Proceedings of a Symposium August 19-21, 1991 Nashville, Tennessee A peer-reviewed publication of the Transportation Research Board TRANSPORTATION RESEARCH BOARD NATIONAL RESEARCH COUNCIL NATIONAL ACADEMY PRESS WASHINGTON, D.C. 1992 .