Abstract
The Swedish National road Administration (SNRA) administers the construction and maintenance of Swedish national roads. In addition, the SNRA has an overall responsibility for road traffic safety in Sweden. These tasks are supported by a system of road traffic surveys, here defined as surveys based on data collection from pre-selected sites on the roads. This paper presents information on the SNRA traffic surveys and discusses research activities including sampling and estimation issues, nonsampling errors, and the use of model-based inference from the surveys. (Author/publisher)