Pavement Profile Smoothness

ASTM defines roughness as the deviations of a surface from a true planar surface with characteristic dimensions that affect a vehicle ride quality.

Smoothness Matters

National surveys of road users list smooth pavement as a top highway characteristic. Rough or uneven pavement adversely affects driver safety, fuel efficiency, ride quality, vehicle wear-and-tear, and pavement durability.

Smoothness Specifications

Inertial Profiler Certification Program

The Inertial Profiler Certification Program is being administered by the Material Engineering and Testing Services group of Caltrans.

File Sharing System

Measuring Smoothness

  • International Roughness Index
  • National Rankings
  • How Texture Relates
  • Measuring Devices

Smoothness Publications and Presentations


Related Websites