Abstract:
Road accidents are national problems. They cause terrible property damage and great losses to liveseach year. Due to the percarious road networks found often around branch roads and curves asdriver have to change approach angles or drive under various restricted circumstances. Presently,Thailand has not earnestly conducted research and has not found a solution for the black spots.Accordingly, this reseach has been undertaken to obtain information about developing a method forincreasing safety standards around black spots using road curves in Thailand as a case study.This study begins with reviewing the documentation and research information associated withexamining and improving measures in order to increase safety on the roads. Subsequently, theresearchers have gathered data about accidents that have occurred on the studied curves and haveexamined the safety issues on the abovementioned curves. Finally, the researchers have presentedways of increasing safety around the studied curves.According to the study, sixty-five percent of accidents occur on curves involving cars that skid offthe roads and turning over on their sides. Seventy percent of the accidents studied involved privatecars and mini trucks with apparently 92 percent of people involved being males. Assumption ismade that 72 percent of all the accidents occurred by driving over the specified speed limit. Sixtythree percent of the accidents often happened on wet roads. The results of the study into the safety of roads with dangerous curves consist of 31 issues. They can be broken down into 7 seperate groups: curves improperly designed for speed, improper traffic equipment, the nature of the vertical plane not being perpendicular to the curve, the viewing distance is not safe enough, there were barricades on side roads that may be dangerous, the road bisection is not standardized, and the roads are slippery when wet. Each group problem can be divided into a sub-group. It was found from thecomparative results that the curves possess 31 problems with 6 major problems that may be thedirect causes of accidents; including the speed design not corresponding to the actual speed ofdriven vehicles, the position of bisecting is improper and unsafe, slippery roads, the curve plane, the area before the curve is straight and too long, and plane of curve has a short radius around the nadir of the curve on a reverse vertical plane.