Setting Speed Limits of Urban Road Networks in Thailand

Abstract

Speeding is one of the most important contributing factors to road traffic accidents, injuries and fatalities in Thailand. However, there is on appropriate method applied to set up the proper. In Thailand, The general speed limits in urban areas has been 80 kph, which may be extremely dangerous for general road users, particularly for Vulnerable Road Users (VRU). Consequently, this paper will present the comparative analysis and the assessment of the posted speed limits achieved from four different (Setting speed limit, SSL) methods, including the City Limits (CLimits), the 85^th Percentile Limits (PLimits), the VLimits and the Bellalite’s limits (BLimits) methods. Eight case studies the urban road network in the Khon Kaen city Thailand is considered. It was found that such posted speed limits obtained from these four methods were generally different. Such speed limits achieved from the CLimits method are the lowest, followed by the BLimits, PLimits and VLimits methods, respectively.