CDL general knowledge practice test 2

B: ¾ second to 1 second. The average reaction time is ¾ second to 1 second, adding about 61 feet traveled at 55 mph. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.6.1 Stopping distance, page 51.

C: 6 seconds. At speeds below 40 mph, a 60-foot vehicle needs 6 seconds (one per 10 feet); over 40 mph it would need 7. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.7.1 Space ahead, page 54.

B: Give them room to go by or stop; do not back up. Give oncoming vehicles room to go by or stop. Don't back up, because you might hit someone behind you. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.7.6 Space for turns, page 57.

C: Give the driver plenty of room and keep a safe following distance. Drifting and inconsistent speed are signs of a distracted driver. Give them plenty of room and keep your safe following distance. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.9.7 Watch out for other distracted drivers, page 69.

B: Between 15 and 50 feet. Vehicles required to stop must stop no closer than 15 feet and no more than 50 feet from the nearest rail. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.15.2 Warning signs and devices, page 80.

A: A 5-ounce glass of 12% wine. A 12-ounce 5% beer, a 5-ounce glass of 12% wine and a 1½-ounce shot of 80-proof liquor all contain the same amount of alcohol. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.22.1 Alcohol and driving, page 94.

D: General Knowledge. The General Knowledge Test is taken by all applicants; the other tests depend on the vehicle and endorsements needed. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 1.1.1 Knowledge tests, page 26.

B: 2/32 inch. Tires other than the front tires need at least 2/32-inch tread depth. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.1.3 What to look for, page 33.

A: 10 feet, 100 feet and 200 feet toward approaching traffic. On a one-way or divided highway, place warning devices 10, 100 and 200 feet toward the approaching traffic. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.5.2 Communicating your presence, page 50.

D: A thin layer of clear ice that makes the road look wet. Black ice is a thin, clear layer that lets you see the road through it and makes the road look wet. Watch for it whenever it's below freezing and the road looks wet. 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: About 216 feet. Braking distance at 55 mph on dry pavement with good brakes is about 216 feet. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.6.1 Stopping distance, page 51.

B: 4 seconds. A 30-foot vehicle needs 3 seconds below 40 mph; add one second above 40 mph for 4 seconds. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.7.1 Space ahead, page 54.

A: After you have reached the center of the intersection. Make sure you reach the center of the intersection before starting a left turn; turning too soon can make your vehicle's left side hit another vehicle because of offtracking. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.7.6 Space for turns, page 57.

A: When the gates are up and the lights have stopped flashing, and it is safe. Remain stopped until the gates go up and the lights stop flashing, then proceed when it is safe. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.15.2 Warning signs and devices, page 81.

B: How much you drink, how fast you drink, and your weight. BAC depends on the amount of alcohol, how fast you drink, and your weight. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.22.1 Alcohol and driving, page 94.

C: Air over hydraulic brakes. The Air Brakes Test is required if your vehicle has air brakes, including air over hydraulic brakes. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 1.1.1 Knowledge tests, page 26.

D: Regrooved, recapped or retreaded tires. Regrooved, recapped or retreaded tires are prohibited on the front wheels of a bus. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.1.3 What to look for, page 33.

C: Move it farther back down the road so drivers get warning. If a hill, curve or other obstruction keeps drivers from seeing you within 500 feet, move the rear-most triangle back down the road to give warning. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.5.2 Communicating your presence, page 49.

C: Open the window and feel the front of the mirror, mirror support or antenna for ice. If there's ice on the mirror, mirror support or antenna, the road surface is probably starting to ice up too. 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: About 419 feet. Adding perception (142 ft), reaction (61 ft) and braking (216 ft) distance, a vehicle at 55 mph travels a minimum of 419 feet. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.6.1 Stopping distance, page 51.

B: When the vehicle ahead passes a landmark, count seconds until you reach the same spot. Wait until the vehicle ahead passes a clear landmark, then count "one thousand-and-one" and so on until you reach the same spot. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.7.1 Space ahead, page 54.

D: The right-hand turn lane. With two left-turn lanes, use the right-hand one. From the inside lane you may have to swing right to complete the turn. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.7.6 Space for turns, page 57.

D: Trains may not sound, or may be prohibited from sounding, horns at some crossings, and cab noise can mask them. Trains may not sound horns at some crossings, and noise inside your vehicle may keep you from hearing a horn until the train is dangerously close. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.15.3 Driving procedures, page 81.

A: The part that controls judgment and self-control. Alcohol first affects the part of the brain controlling judgment and self-control, which can keep drinkers from knowing they are getting drunk. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.22.1 Alcohol and driving, page 94.

B: A TSA background check. To get the HazMat endorsement you must pass the Hazardous Materials Test and a Transportation Security Administration (TSA) background check. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 1.1.1 Knowledge tests, page 27.