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As the data for road weather stations is used for online traffic control within section control systems, it is very important for the efficiency of the traffic control systems to be based on reliable data of a high quality. Therefore, a Test Site for checking the quality of road weather stations was established near Munich in Germany in 2003 and has been operational since then. In close co-operation with all participants (sensor manufacturers, road authorities, German Federal Research Institute, research and consultancy bodies), the overall goal was to improve the sensors" quality as well as to establish methods to detect failures in measurements. Furthermore, several improvements were carried out within the scope of the Test Site using the expertise of all participants and the infrastructure of the Test Site. The developments, reports and results obtained are both significant and helpful for manufacturers, road authorities, practitioners, research and consultancy.
The German Federal Ministry of Economics and Technology is funding a projectrncalled "Leistra2" with the aim of understanding the tire road contact and to find measures to reduce traffic noise, in particular to reduce the noise of tires rolling on pavements, i.e. tire-road noise. The project is composed out of three mayor subjects, low noise tires, low noise pavements and verification of the results, each made out of single sub-projects. The purpose of this paper is to give a survey about Leistra2 and to report about the latest activities and results. More detailed information and contact data of the partners involved can be found at http://www. LeiStra2.de. The program is the successor of the program LeiStra (Leiser Strassenverkehr), dealing with similar topics.rn