AASHTO GSW-5, Guide for Maximum Dimensions and Weights of Motor Vehicles, Fifth Edition (2016), addresses vehicle size and weight limits and the permit practices applied to overweight and oversize movements. Chapter 1 defines commonly used terms, and Chapter 2 describes the vehicles in regular operation on the highway system. Permit harmonization across states is the subject of Chapter 3, and Chapter 4 covers permit operations. Chapter 5 addresses national defense considerations. That chapter reflects the need for military vehicles and equipment to move over the highway network. The material is intended for state agencies and commercial carriers dealing with size and weight regulation, with the aim of improving safety, protecting highway and bridge infrastructure, and streamlining regulatory processes around permitted vehicles.