Driving SafelyCâu 49 / 60
What causes a trailer to swing out and jackknife (trailer skid)?
a.The trailer wheels lock up and the trailer slides sideways, often from hard braking or braking in a turn
b.The trailer wheels have too much traction
c.The kingpin is greased
d.The load is too low
Giải thích
A trailer jackknife happens when the trailer wheels lock and lose traction, causing the trailer to slide sideways and swing around toward the tractor. Hard braking, braking in a curve, or slippery roads can trigger it. Smooth braking and keeping traction on the trailer wheels help prevent it.
Luyện miễn phí toàn bộ 60 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- To make a right turn with a combination vehicle and avoid the trailer wheels hitting the curb, you should:
- What is the main cause of trailer rollover in combination vehicles?
- How can you reduce the risk of rollover when loading a trailer?
- If your trailer begins to swing out in a jackknife, what should you generally do?
- Why do combination vehicles need a longer following distance than smaller vehicles?
- At 50 mph in a 60-foot combination vehicle, about how many seconds of following distance should you keep?
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Đội Ngũ Biên Tập PrepPass · Đối chiếu với CDL Combination Vehicles Knowledge Test · Quy trình kiểm tra