Tillståndsuppföljning av observationssträckor: lägesrapport för LTPP-projektet till och med 2012-–12

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The objective of this project is to collect and deliver high quality road data primarily for the development of performance prediction models. The monitoring of the LTPP sections started in 1984 on commission of the Swedish Road Administration. The aim is primarily to focus on road deterioration caused by heavy traffic. In 2012 there were still 304 active LTPP sections distributed over 33 sites. The monitoring programme includes the following activities: • Distress surveys. Annual surveys are carried out by walking over the sections. During the survey all distresses and surface defects are recorded. The grading of the distresses and defects is based on a national distress manual. • Road surface monitoring. The monitoring is carried out every second year using a vehicle developed by VTI. The ‘Laser Road Surface Tester’ can be equipped with up to 19 laser gauges. • Measurement of the bearing capacity. The capacity is calculated with a Falling Weight Deflectometer and normally carried out one year after maintenance measures. The normal strategy is to measure all new sections and after maintenance. • Collection of climate data from automatic weather observation stations close to the sections. • Collection of traffic data normally every fourth year. • Quality control check of all collected data. • Calculation of an annual crack index. The index is calculated from the type of crack, crack distress grade and crack propagation.

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