Traffic Laws

Study questions with answers

3 sample Traffic Laws questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.

1. 1. Air-braked truck tractors are required to have antilock brakes if they were built on or after which date?

   Correct answer: March 1, 1997

   The requirement covers air-braked truck tractors built on or after March 1, 1997; most other air-braked vehicles, trailers, and dollies are covered from March 1, 1998.

   Source: Arizona CDL Manual — Section 5.1.16: Antilock Braking Systems (ABS)

2. 2. What is a reliable way to find out whether your vehicle was built with antilock brakes?

   Correct answer: Read the certification label to see when the vehicle was built

   The manufacture date on the certification label tells you whether the vehicle falls under the ABS requirement; you can also look for the malfunction lamp or the control unit and sensor wiring.

   Source: Arizona CDL Manual — Section 5.1.16: Antilock Braking Systems (ABS)

3. 3. Which statement about braking with the front wheels of an air-braked vehicle is true?

   Correct answer: Front-wheel braking helps in all conditions and rarely skids, even on ice

   Old front-brake limiting valves cut front pressure on the 'slippery' setting, but testing shows front-wheel braking helps in every condition and front skids are unlikely even on ice, so keep any such control on 'normal'.

   Source: Arizona CDL Manual — Section 5.1.13: Front Brake Limiting Valve