Safe DrivingCâu 37 / 120
Which factors determine the safe speed for descending a mountain grade?
a.Only the posted speed limit
b.Total vehicle weight, length and steepness of the grade, road and weather conditions, and the amount of traffic
c.Only the size of the engine
d.Only the type of brakes installed
Giải thích
Safe descent speed depends on how much weight the brakes must control, how long and steep the grade is, and the conditions around you. A posted limit is a maximum for ideal conditions, and neither engine size nor brake type alone determines a safe speed.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Rain has just begun after a long dry spell and the road surface is slick. How should you adjust your following distance and speed?
- You are approaching a curve posted at 40 mph while driving a loaded tractor-trailer. What is the safest approach?
- You are starting down a long, steep grade in a loaded truck. What is the correct braking technique?
- How far ahead should a commercial driver normally be looking while driving?
- How often should you check your mirrors while driving?
- Where are the largest blind spots on a tractor-trailer?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với Commercial Driver's License (CDL) General Knowledge Test · Quy trình kiểm tra