Research Issues in Swedish Road Traffic Surveys

The SwedishNational Road Administration SNRA administrates the constructionand maintenance of Swedish state roads. In addition, the SNRA hasan overall responsibility for road traffic safety in Sweden. Thesetasks are supported by a system of road traffic surveys by which wemean here surveys based on data collection from pre-selected siteson the roads. The data collection is conducted by observers or byusing equipment such as traffic analyzers and pneumatic tubes. Onepart of the system is the so-called Traffic Measurement Systemwhich includes the surveys of Annual average daily traffic AADT andChange of total vehicle mileage. Another part of the system isdirectly connected to road traffic safety and includes surveys ofvehicle speed, seat belt use, and bicycle helmet use, for example.The surveys of traffic safety are based on a master sample ofroads, designed for a broad use of traffic surveys. We present theSNRA traffic surveys and discuss research activities includingsampling and estimation issues, non-sampling errors and the use ofmodel-based inference from these surveys.
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