Development Guidance

National Guidance

How do you develop a smoothness specification? AASHTO has developed standards to help states develop smoothness specifications. It should be noted, however, that these specifications are geared towards “Ride Quality” specifications using inertial profilers. See the AASHTO Specification page for further details.

An Example of Advanced Smoothness Specification

The draft HMA Smoothness Specification (Section 401) from the FHWA Western Federal Lands Highway Division is the most advanced smoothness specification. This specification contains the following features:

Download a copy of the Western Federal Lands HMA smoothness specification here!