The aim of this study was to investigate: - If the test drivers differ from the general population of drivers concerning speed level. - How the speed level changes on different street types when the test drivers drive with active accelerator pedal. - If the test drivers change their driving style after long time use of active accelerator pedal. - If there is compensatory behaviour within the city in form of test drivers not lowering their speed in "low-speed situations" or in form of higher speeds when they leave the test area. - If the test drivers use the active accelerator pedal voluntarily outside the test area. - If travel time changes when driving with the active accelerator pedal. - If fuel consumption and exhaust emissions change when driving with the active accelerator. The analyses of the studied variables were made for a before period and two after periods - the short time use period, directly after activating the active accelerator pedal and the long time use period, about 3 to 11 months after activating the system.