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Safer Roads & Mobility

Vehicle Speeds At Intersection Approaches: Hulu Langat Case Study

More than a quarter of accidents reported by the PDRM occur at intersections. This report highlights factors associated with speed control by identifying the speed of vehicles at intersection approaches. Hulu Langat district was used in the case study where characteristics such as intersection geometry and intersection control type were included in the selection of the intersections. The speed of vehicles was recorded for two hours day-time off-peak (10:00 a.m.–12:00 p.m.), and two hours night-time off-peak (9:00 p.m.–11:00 p.m.) at all intersections. A total of 102,658 speed readings were obtained throughout the study. Variables that were hypothesised to be related to the driving speed at intersection approaches including vehicle type, time of day, presence of warning sign, number of lane, area type, intersection control type as well as intersection geometry. Statistical analysis was conducted to test the effects of these variables on the driving speed at intersection approach. Area type (residential and commercial) and number of lanes per direction had greater influence on driving speed at  intersection approaches  compared to other tested variables. Residential areas recorded an average speed higher than commercial and residential-commercial area. In  addition,  two-lane per direction approach gave a higher  mean speed compared  to one-lane or three-lane approaches. Speed violation accounted  for  18.5%  of  the  total  data  observed  where  the highest violation occurred  on  roads with lower  speed limit (60 km/h). The  majority  of violators  were  car  drivers,  which  accounted  for  70% of the total speed violation samples.It is worth mentioning that speed violations were higher during the day compared to at night. Though the percentage of vehicles identified for overspeeding at intersections  is relatively small, its presence is notable. The findings indicate that further study is required in identifying underlying issues that contribute to the significant percentage of accidents occurring at intersections.