ABSTRACT
In the period 1999–2002 the Swedish National Road Administration conducted a large-scale field test with Intelligent Speed Adaptation (ISA) in urban traffic in four Swedish cities. Approximately 5000 vehicles were equipped with different ISA systems to help prevent the drivers from exceeding speed limits. The objective of the test was to learn more about driver attitudes to ISA and how drivers use the systems, impact on road safety and environment, and the integration of the systems in the vehicles.
One of the participating cities was Umeå, where 4000 vehicles were equipped with an informative ISA device that by sound and light warned the driver when exceeding the speed limits. By involving such a large number of vehicles (approximately 10 per cent of the fleet of private vehicles in Umeå) the intention was to have a large enough car fleet equipped with an ISA device that it might be possible to determine if there were any spill over effects on speed.
In this paper results from the three-year field-test in Umeå is reported. More specifically this chapter reports on effects on speed (actual as well as self-reported speed) in vehicles equipped with an ISA device and effects on speed for the city car fleet, i.e. spill over effects. In addition, attitudes towards an ISA device are discussed.
