摘要
Accidents are in rising mode and became the main problem all over the world especially in Malaysia as the reasons including the condition of the road, driver's reaction and the road environment. Actually, those condition also factors to execute the lane changing which experienced by all drivers such as in U-turn road segment. In approaching U-turn segment, drivers needed to make a decision whenever any disruption in front of them such as merging vehicle because they have their own perspective and desire. For that purpose, this research is focusing on the reaction of the driver in approaching the U-turn facility road segment especially in speed (V), reaction time (RT) and distance where from those parameters and their relationships, the statistical model was developed and used in estimating the safe distances to execute the lane changing from the merging vehicle. The data were taken from the field and driving simulator to come out with the raw data. The field data were from video recording that has been used to simulate the driving simulator. Therefore, through the relationship between the RT, speed (V) and distance of the subject vehicle to the merging vehicle, the statistical model has been developed with the equation D.4MVUT = (13.448 + 1.410 RT- 0.075 V).