In 1989 the National Cooperative Highway Research Program of the Transportation Research Board awarded NCHRP Project 22-10 to Momentum Engineering, Inc. of Franklin, Tennessee. The purpose of this project was to update the 1979 AASHTO-ARTBA-AGC Document, A Guide to Standardized Highway Barrier Rail Hardware. The draft document was extensively reviewed by AASHTO-ARTBA-AGC Task Force 13, industry representatives, personnel at many DOT's in April of 1994. The document was approved by AASHTO-ARTBA-AGC Task Force 13 at thier Fall 1994 meeting. AASHTO approved publication of the document in the spring of 1995 as the result of a member ballot. Dr. Malcolm Ray put the draft materials on the web in 1995 as a service to the roadside safety community and to provide a means of exchanging up-to-date roadside hardware information. Since the completion of the NCHRP Project with Momentum Engineering, the document has been maintained by AASHTO-ARTBA-AGC Joint Committee on New Materials Task Force 13. In 2004 the Task Force with the assistance of the National Cooperative Highway Research Program began revising the Hardware Guide to be a web-based document. This work was performed by Malcolm Ray and Jennifer Weir under NCHRP Project 20-7(192), and it was completed in October 2005.