“…Some researchers have examined the causes of truck collision accidents on continuous downhill sections. The causes are complex, but some of the major ones include brake failure resulting from high temperatures (8,9); lack of downhill driving experience, brake drum problems, and incomplete traffic signs (10,11); driving above the recommended speed limit (12,13); horizontal alignment (14,15); curve length, curve curvature, longitudinal gradient, and average daily traffic volume (16); length of the longitudinal slope, annual average daily traffic volume, gradient of the longitudinal slope, number of lanes, and width of the right shoulder (17); failing to downshift, improper gear or very high speed (82%), driver lacking driving experience or being unfamiliar with road conditions (43%), incomplete traffic signs (14%), poor braking or inappropriate braking operation (36%), and drunk driving or fatigue driving (21%) (18). These research findings provide a foundation to formulate and improve truck accident prevention strategies on continuous downhill sections of highways.…”