CDL Combination Vehicles (Guaranteed Pass!!)

Fully loaded rigs are _____ times more likely to roll over in a crash than empty rigs. correct answers 10 What 2 things help prevent a rollover? correct answers - Keep the cargo as close to the ground as possible - Drive slowly around turns Bobtails can be very hard to stop smoothly. It takes them longer to stop than a tractor-semitrailer loaded to maximum gross weight. True or False? correct answers True Trailer Jacknife correct answers When the wheels of a trailer lock up, the trailer will tend to swing around. This is more likely to happen when the trailer is empty or lightly loaded. What should you do if your trailer jacknifes? correct answers Release the brakes to get traction back. Do not use the trailer hand brake (if you have one) to "straighten out the rig." This is the wrong thing to do since the brakes on the trailer wheels caused the skid in the first place. Once the trailer wheels grip the road again, the trailer will start to follow the tractor and straighten out. Off-tracking correct answers When a vehicle goes around a corner, the rear wheels follow a different path than the front wheels. Backing with a trailer correct answers When backing a trailer, you turn the steering wheel in the opposite direction. Once the trailer starts to turn, you must turn the wheel the other way to follow the trailer. When you turn suddenly while pulling doubles, which trailer is most likely to turn over? correct answers The rear trailer is twice as likely to turn over as the tractor. Trailer Hand Valve correct answers The trailer hand valve works the trailer brakes. The trailer hand valve should be used only to test the trailer brakes. Do not use it in driving because of the danger of making the trailer skid. The foot brake sends air to all of the brakes on the vehicle, including the trailer(s). There is much less danger of causing a skid or jackknife when using just the foot brake. Never use the hand valve for parking because all the air might leak out, unlocking the brakes (in trailers that do not have spring brakes). Always use the parking brakes when parking. If the trailer does not have spring brakes, use wheel chocks to keep the trailer from moving