"The synthesis describes the current state of the practice regarding state transportation agency standards and strategies that determine and define the service

TRB's National Cooerative Highway Research Program (NCHRP) Synthesis 303: Assessment and Rehabilitation of Existing Culverts summarizes the state of the practic

"TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 474: Service Life of Culverts explores the time during which a culvert is expected to pro

NCHRP synthesis 371 explores the state of the practice for managing transportation infrastructure assets other than pavements and bridges, and documents gaps in

The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies t