bstract—The Intelligent Transportation System (ITS) in
Thailand has been developed since 2009. The Image Sensing
Software has also been written and applied with the CCTV
cameras, routers, cable communication equipments and servers.
Moreover, the software, especially the measurement of each
vehicle approaching to a Virtual Loop Detector (VLD) on
pavement is evaluated for the classified counting, headway and
speed of vehicles. As a result, the starting and final speed can be
calculated of the Perception and Reaction Times and Distances
(PRT and PRD) for the mitigation of Traffic Accident