This report documents a new approach, called forwardcalculation, used for determining layered elastic moduli from in situ load-deflection data. Guidelines are provided for carrying out  forward calculation procedures as well as screening backcalculation results using forward calculated moduli.
 

This report will be of interest to highway agency engineers involved in pavement analysis, design, construction, and deflection data collection, as well as researchers who will use the Long-Term Pavement Performance (LTPP) load-deflection data to improve design procedures and standards for constructing and rehabilitating pavements.