Traffic Laws

Study questions with answers

7 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. Truck tractors with air brakes must be equipped with antilock brakes if built on or after:

   Correct answer: March 1, 1997

   Air-brake truck tractors made on or after March 1, 1997 are required to have ABS.

   Source: Section 5.1.16 - Antilock Braking Systems (ABS)

2. 2. Front brake limiting valves were installed on some vehicles built before which year?

   Correct answer: 1975

   Some vehicles made before 1975 have a front brake limiting valve and a cab control; keeping it in the normal position gives full stopping power.

   Source: Section 5.1.13 - Front Brake Limiting Valve

3. 3. Air-brake trucks, buses, trailers, and converter dollies must have ABS when built on or after:

   Correct answer: March 1, 1998

   Other air-brake vehicles, including trucks, buses, trailers, and converter dollies, are required to have ABS if built on or after March 1, 1998.

   Source: Section 5.1.16 - Antilock Braking Systems (ABS)

4. 4. Since which year have all vehicles been built with automatic slack adjusters?

   Correct answer: 1994

   Every vehicle built since 1994 has automatic slack adjusters, but they still must be checked during inspection.

   Source: Section 5.3.2 - Check Slack Adjusters

5. 5. The surest way to know whether a particular vehicle has ABS is to:

   Correct answer: check the certification label for its date of manufacture

   Because ABS is tied to build dates, checking the certification label for the manufacture date tells you whether the vehicle should be equipped.

   Source: Section 5.1.16 - Antilock Braking Systems (ABS)

6. 6. Every vehicle with air brakes is required to have which of these?

   Correct answer: A low air pressure warning signal

   A low air pressure warning signal is mandatory on air-brake vehicles; the other items are optional features found only on some vehicles.

   Source: Section 5.1.11 - Low Air Pressure Warning

7. 7. Besides the service brakes, all trucks, truck tractors, and buses must be fitted with:

   Correct answer: emergency brakes and parking brakes

   These vehicles must have emergency and parking brakes held on by mechanical force; spring brakes usually meet that requirement.

   Source: Section 5.1.14 - Spring Brakes