AASHTO R 55

Description / Abstract: This practice covers the procedures for quantifying cracking in asphalt pavement surfaces, both in wheelpath and non-wheelpath areas. Detailed specifications are not included for equipment or instruments used to make the measurements. According to this standard, any process that can quantify, with the accuracy stipulated herein, and that can be adequately validated, is considered acceptable.

Note 1—Standardization will produce consistent pavement condition estimates for network-level pavement management. As an option, the user may define and collect other data, such as edge cracking, centerline cracks, and transverse cracks. This standard is designed for use primarily with automated data collection equipment. However, accommodations have been made for manual methods.

Either automated or manual data collection surveys as defined below are acceptable.

Automated Data Collection—Use a vehicle traveling at near highway speeds and collect data on the entire length of roadway (100 percent sample).

Manual Data Collection—Observe distresses and record data on a statistically reliable sample of the lane surveyed. The confidence level in the results for each section should exceed 85 percent. Rating continuous film or tape in an office setting is considered a manual survey.

This practice does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and determine the applicability of regulatory limitations related to and prior to its use.