CDL general knowledge practice test 3

C: The nuts may be loose. Rust around lug nuts may mean the nuts are loose, so check their tightness. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.1.3 What to look for, page 33.

B: Held between yourself and oncoming traffic. Hold the triangles between yourself and oncoming traffic so other drivers can see you. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.5.2 Communicating your presence, page 50.

B: The water mixes with oil left on the road. Right after rain starts, water mixes with oil left on the road and makes it very slippery until continued rain washes the oil away. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.6.2 Matching speed to the road surface, page 52.

C: They become 4 times greater. Doubling speed makes the impact and braking distance 4 times greater; tripling to 60 mph makes them 9 times greater. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.6.1 Stopping distance, page 51.

A: Stay in the right lane if you can. Heavy vehicles that can't keep up are often tailgated, so stay in the right lane if you can and only pass if you can do it quickly and safely. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.7.2 Space behind, page 55.

C: Make sure no other train is near, because one train can hide another. Where there are two tracks, one train can hide another, so check again that no other train is near before crossing. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.15.3 Driving procedures, page 81.

D: Weaving and running over the curb. Alcohol causes errors such as slower reaction to hazards, driving too fast or slow, driving in the wrong lane, running over the curb and weaving. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.22.1 Alcohol and driving, page 95.

B: 1,000 gallons. You need the tank test to haul liquids or gases in tanks rated over 119 gallons each with a combined capacity of 1,000 gallons or more, whether the tanks are fixed or temporary. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 1.1.1 Knowledge tests, page 27.

B: Stop a short while later and re-check the tightness of the lug nuts. After a tire change, stop a short while later and re-check that the nuts are tight. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.1.3 What to look for, page 33.

A: The four-way emergency flashers. Turn on the four-way flashers; don't trust taillights alone, because drivers have hit parked vehicles thinking they were moving. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.5.2 Communicating your presence, page 49.

A: Release the accelerator and push in the clutch. Release the accelerator and push in the clutch to slow down and let the wheels turn freely. Do not use the brakes to slow down. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.6.2 Matching speed to the road surface, page 52.

D: 16 times. Going four times as fast (20 to 80 mph) makes impact and braking distance 16 times greater. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.6.1 Stopping distance, page 51.

D: Increase your following distance and avoid quick changes. Increase your following distance, signal early and slow gradually; don't speed up, and avoid tricks like flashing brake lights. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.7.2 Space behind, page 55.

B: Check traffic behind you, stop gradually, use a pullout lane if available, and turn on your four-way flashers. Slow down gradually while watching traffic behind you, use a pullout lane if there is one and turn on your four-way flashers. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.15.4 Stopping safely at railroad-highway crossings, page 81.

C: When the doctor has told the driver it will not affect safe driving ability. Possession and use of a drug given by a doctor is permitted if the doctor informs the driver it will not affect safe driving ability. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.22.2 Other drugs, page 95.

B: 14 days. After passing the required knowledge tests, you must have held your CLP for 14 days before taking a skills test. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 1.1.2 Skills tests, page 27.

A: Wheels or rims that have had welding repairs. Wheels or rims that have had welding repairs are not safe. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.1.3 What to look for, page 33.

B: Get out of the vehicle and away from the tracks. Get out of the vehicle and away from the tracks, then call 911 or the posted emergency number and give the crossing location, especially the DOT number if posted. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.15.6 Special situations, page 82.

C: 30 mph. With enough standing water, tires can lose contact with the road at speeds as low as 30 mph. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.6.2 Matching speed to the road surface, page 52.

A: An empty truck has less traction. Brakes, tires, springs and shocks work best fully loaded; an empty vehicle has less traction, so it needs more distance to stop. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.6.1 Stopping distance, page 51.

C: It's safer to be tailgated at a low speed than a high speed. Don't speed up. It is safer to be tailgated at a low speed than at a high speed. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.7.2 Space behind, page 55.

C: At least 14 seconds. A typical tractor-trailer takes at least 14 seconds to cross one track and more than 15 seconds for two, so be sure you can get all the way across. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.15.5 Crossing the tracks, page 82.

B: Over-the-counter cold medicines. Many prescription and over-the-counter drugs, such as cold medicines, can make a driver drowsy or otherwise affect safe driving. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.22.2 Other drugs, page 95.

C: Vehicle inspection, basic vehicle control, on-road driving. The skills tests must be taken in this order: vehicle inspection, basic vehicle control, then on-road driving. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 1.1.2 Skills tests, page 27.

B: 10 degrees (about 2 inches at the rim of a 20-inch wheel). Play of more than 10 degrees, about 2 inches of movement at the rim of a 20-inch wheel, can make steering difficult. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.1.3 What to look for, page 33.