During the period 1999-2002 the Swedish National Road Administration conducted a comprehensive road information project which included a large-scale trial involving Intelligent Speed Adaptation in urban areas. Several thousand vehicles have been equipped with voluntary, supportive and informative systems to help keep drivers from exceeding the speed limit. The systems were tested in Borlänge, Lidköping, Lund and Umeå, where the local authorities were responsible for running the trials in their respective municipalities. Over the three years of the project, the Swedish National Road Administration provided SEK 75 million in funding, and was also responsible for the overall co-ordination of the technology involved, as well as for evaluating the comparative advantages and disadvantages of the various systems. 1999 saw the planning of how the trial would be implemented and evaluated and in 2000 the systems started being installed in the vehicles. Most of the actual field trials were carried out in 2001. The submitted report documents the background, implementation and the results of the comparative evaluation of the individual systems, which were made centrally by the Swedish National Road Administration. The report is designed to provide information and guidance for the continued consideration of a possible introduction of a speed adaptation system on a large-scale.