Abstract
This report will give an overviewof the state of research concerning the development of an optical vehicle detection system, albe to measure speed, volume, headways and lengths of vehicles travelling on one lane. The system makes use of a C.C.D. (Charge Coupled Device) camera and a microprocessor. The measuring system will be briefly described. This report will mainly focus on the results of comparative tests that have been made to evaluate the accuracy of the system. The different factors that affect the accuracy will here be described. An overview will also be given of further developments of the system and the extension to a scheme for simultaneous surveillance of three lanes with traffic traveling in both directions.