CHANGE OF MOTORCYCLE SPEEDUNDER SPEED ENFORCEMENT CAMERA ON URBAN ARTERIAL IN KHON KAEN CITY, THAILAND
Keywords:Speed, Motorcycle, Speed enforcement cameras, Urban arterial
Road traffic injuries tend to become more serious all over the world as well as the number of road fatalities, serious injuries that lead to disabilities, which is also increasing. Speeding is one of the top causes of death and injury. At present, Thailaw has limited the speed in urban areas at 80 km/h for passenger cars and motorcycles.This speed limit is too high for motorcyclists to prevent injury and fatality in case of an accident. The objective of this studyis to explorethe change of speed of motorcycles after the installation of speed enforcement cameras.The speeds of motorcycles before and after the installation of speed enforcement cameras were collected by applyingspot speed method at 28 points along the project corridor. The change of speeds was analyzed using t-test at 95% confidence level.As a result, the 85thpercentile speed of motorcyclessignificantly decreasedafter the installation of a speed enforcement camera,whereas the mean speed of motorcycles was constant.