Alabama CDL General Knowledge Practice Test # 3

Question 1

HOW FAR AHEAD SHOULD YOU LOOK WHEN DRIVING?

Accepted Answer

12 to 15 seconds

Answer

Professional drivers of Commercial Motor Vehicles (CMVs) are taught to look 12 to 15 seconds ahead of their vehicle. This provides enough time to identify potential hazards, anticipate traffic changes, and react safely. At highway speeds, 12-15 seconds translates to approximately a quarter-mile, allowing for ample decision-making and maneuvering time.

Question 2

WHAT IS "BLACK ICE"?

Accepted Answer

Thin sheet of clear ice on roadway

Answer

Black ice is a thin, transparent layer of ice that forms on the road surface, often appearing as wet pavement rather than obvious ice. Because it's clear, it's extremely difficult for drivers to see, making it particularly dangerous. It typically forms when temperatures are at or near freezing and moisture is present, creating a highly slippery and unexpected hazard.

Question 3

WHAT IS THE MOST IMPORTANT REASON FOR DOING A VEHICLE INSPECTION?

Accepted Answer

Safety is the most important reason to inspect your vehicle

Answer

While vehicle inspections are legally required and help prevent breakdowns, the paramount reason for conducting a thorough pre-trip inspection is safety. Identifying and addressing potential mechanical issues before starting a trip significantly reduces the risk of accidents, protecting the driver, other road users, and the cargo. A safe vehicle is a reliable vehicle.

Question 4

YOU CAN SAFELY REMOVE THE RADIATOR CAP AS LONG AS THE ENGINE ISN'T OVERHEATED.

Accepted Answer

FALSE

Answer

It is never safe to remove a radiator cap when the engine is hot, even if it's not "overheated." The cooling system operates under pressure, and removing the cap while hot can cause superheated coolant and steam to erupt violently. This can result in severe burns. Always wait until the engine has completely cooled down before attempting to remove the radiator cap.

Question 5

IF YOU GO TWICE AS FAST, YOUR STOPPING DISTANCE WILL INCREASE BY TWICE OR 4 TIMES?

Accepted Answer

Four times

Answer

Stopping distance increases exponentially with speed, not linearly. If you double your speed, your braking distance (the distance traveled after applying brakes) increases by a factor of four. This is because kinetic energy, which must be dissipated to stop the vehicle, is proportional to the square of the speed (E = 0.5 * m * v^2). Therefore, going twice as fast means four times the energy to dissipate, leading to four times the braking distance.

CDL Practice Test

CDL Practice Test

Alabama CDL General Knowledge Practice Test # 3