Vehicle speed detection is very important for observing speed limitation law and it also demonstrates traffic conditions and most important for safety. The system is calibrated based on geometrical equations that were supported directly by using references. System calibration for exact measurements may be possible while accurate speed estimation can still be quite difficult to achieve. The designed system has the ability to be extended to another related traffic application. The average error of the detected vehicle speed was ± 7 km/h and the experiment was operated at different resolutions and different video sequences.