Tillståndsuppföljning av observationssträckor: lägesrapport för LTPP-projektet till och med december 2014

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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 sections (100 m 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 but, in 2014, the number has increased to 690 sections distributed over 65 sites. All sections are included in Sweden’s national road network. An example of use is that in 2000 VTI was commissioned by the Communications Research Board (KFB) to develop crack initiation and propagation models caused by traffic loading. The procedure was similar to the approach applied to the development of crack models used in the PARIS (Performance Analysis of Road Infrastructure) project. The basis of these models was founded upon data collected in this project. Another example is that VTI, commissioned by the then National Road Administration, performed validation of the software tool used for the calculation of road bearing capacity – PMS Object. The first phase included valuation of new construction and was carried out during 2003 and 2004. The second phase evaluated reconstruction and was completed at the start of 2005. In addition, a prediction model for rut depth caused by heavy traffic has also been developed and a report was published in the beginning of year 2007. A current VTI project aims to develop a calculation tool for life cycle cost assessments of various design options in the planning and design of roads. In order to predict future maintenance requirements for various designs options, condition development models are being used to forecast condition and cost requirements during the roads lifecycle. The LTPP database has also been used to help calibrate models for conditions such as rutting, cracking and durability. It has also helped to validate condition development and the need for maintenance action.

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