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The National Academies

NCHRP Synthesis 20-05/Topic 10-05 [Final (Synthesis)]

Collection and Use of Pavement Condition Data
[ NCHRP 20-05 (Synthesis of Information Related to Highway Practices) ]

  Project Data

Pavement condition data are collected and used to establish maintenance and rehabilitation priorities, to select maintenance and rehabilitation strategies, and to project pavement performance. The pavement condition data is grouped as follows: roughness (ride), surface distress, structural evaluation (deflection), and skid resistance. The equipment used to measure roughness includes the CHLOE profilometer, car ride meter, and loser profilometer. Most agencies used a car ride meter. Advantages and disadvantages of the latter are noted. Surface distress ( a measure of pavement fracture, distortion, and disintegration) information is obtained by surveying and recording various defects such as cracking and rutting. Survey methods are usually subjective and variation in data can be minimized by having rates stop at the same location each year, obtaining data every 1 or 0.5 mi, obtaining a consensus of at least two raters for each segment, and keeping procedures as simple as possible. Structural adequacy is measured, by surface deflection measurements (Static deflection, steady - state dynamic deflection, impact - load response). Skid resistance data are routinely collected by most agencies by locked-wheel or yaw-mode trailers. The amount of pavement network on which data are collected varies among the agencies. Problem areas encountered during data collection and analysis are noted."  The report for this topic can be purchased at http://www.trb.org/news/blurb_detail.asp?id=3481

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