Uppföljning av vägars tekniska tillstånd: lägesrapport för observationssträckor ingående i det svenska LTPP-projektet till och med december 2018

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The objective of this project is to collect and deliver high quality road data primarily for use in the development of performance prediction models. Monitoring of the LTPP (Long Term Pavement Performance) sections (100-metre-long) started in 1984 on commission of the Swedish Road Administration. The aim is primarily to focus on road deterioration caused by heavy traffic. The project started with a limited amount of sections and have in 2018 increased to 698 sections distributed over 66 sites. All sections are part of the Swedish national road network. During the years, some sections have become redundant and therefore a number of replacement sections are included. Budget restrictions in 2000 resulted in a review of the sections and a 25 percent reduction in monitoring was implemented. Despite this decrease, the project purpose could still be maintained. By retaining the most strategically important routes and reducing the number of surveys useful high-quality data could still be obtained from the sections left in the monitoring program. In addition, the introduction of median barriers on some sections (to facilitate traffic separation) has meant a disqualification of suitability. At the start of 2019, 297 sections distributed over 33 sites will remain active.

The following activities are included in the monitoring programme:

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 are based on a national distress manual.

• Calculation of an annual crack index. The index is calculated from the type of crack, crack distress grade and crack propagation and is included, in table form, in the database.

Road surface monitoring. Financial restrictions limit the monitoring to every second year. However, the development of rut and longitudinal unevenness follow a relatively linear trend, so monitoring every second year is considered acceptable in this case.

• Measurement of the bearing capacity (KUAB-FWD). The capacity is measured on all new sections and after any maintenance measures.

Cross section profiling (PRIMAL-profiling) is no longer carried out.

• Collection of climate data from SMHIs automatic weather observation stations.

• Collection of traffic data normally every fourth year.

• Quality control check of all collected data before being entered into the LTPP-2018 data base (Microsoft Access 2007–2016).

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