Initial and rehab service periods are longer than those currently stated by most agencies. Environment appears to have a more pronounced effect on life performance than was previously thought. Adjustments in lifecycle cost analysis should be re-considered by agencies in most cases, based on historical data. For roads with less traffic, more engineering analysis should be used for design standards and maintenance applications where performance varies. All asphalt pavements are being extended well beyond their expected life by timely maintenance and surface restorations.
Asphalt pavements are in much better shape than most agencies generally perceive.
In general, most asphalt pavement on mainline roads and streets is well above a PCR of 70, which indicates the need for surface restoration according to guidelines for this study. The predicted service life, based on the linear regression, is also displayed for a PCR of 70. Major rehabilitation would be expected to occur at a PCR of 60 or, in some states, 50. Currently, the program indicates only the data for a PCR of 70, but future plans call for adding the information to show these multiple data points. The traffic, or functional, classification is divided into six different classes.