Abstract
The General Pavement Studies (GPS) are a series of studies selected in-service pavements structured to develop a comprehensive national pavement performance database that meets the objectives of the SHRP Long-Term Pavement Performance (SHRP-LTPP). The purpose of this report is to document the development, evolution, and current status of GPS. Data collection criteria were developed for each of the various data elements in GPS, including traffic, skid resistance, deflection, profile, distress, environment, material properties, and climate. Some data were collected by states, others by the SHRP regional offices. Data that have been released can be accepted through the Transportation Research Board. (A)