AASHTO GDPS-4-M, Guide for Design of Pavement Structures, 4th Edition (1993), provides approaches to pavement design for highway applications. The guide addresses design and management principles for pavement structures and presents procedures for new construction or reconstruction. Additional procedures extend the guidance to other pavement design situations covered by the guide. The publication code identifies this as the metric edition of the guide. A 1998 supplement to the guide is issued as a separate file alongside the main publication. Pavement designers in highway agencies and their consultants can use the guide as a reference for pavement design work.