Washington CDL Practice Test 2026

Practice question bank

Sample questions

1. What is the left lane rule?

   • Heavy vehicles must only be driven in the left lane of a road with three lanes traveling in one direction.
   • Heavy vehicles may only be driven in the left lane of a road with three lanes traveling in one direction if making a left turn. ✓
   • Heavy vehicles cannot be driven in the left lane of a three lane road for any purpose.

   General Driving Knowledge · Answer: B · Official handbook: dol.wa.gov

2. Poisonous fumes can enter a cab due to:

   • A defective exhaust system. ✓
   • Using the wrong type of fuel.
   • A lack of oil in the engine.

   Vehicle Equipment & Safe Operation · Answer: A · Official handbook: Texas Commercial Driver License Handbook (DL-7C), Section 2 – Driving Safely, p. 30

3. When approaching a railroad crossing, a bus driver should:

   • Stop the bus between 15 and 50 feet from the nearest track. ✓
   • Drive cautiously, but not stop the bus unless a train is coming.
   • Speed up to ensure the bus has momentum to cross the tracks.

   Sharing the Road · Answer: A · Official handbook: Texas Commercial Driver License Handbook (DL-7C), Section 10 – School Buses, p. 143

4. In cool weather, as the temperature begins to rise and ice begins to melt:

   • It is usually safe to drive.
   • The road will become even more slippery. ✓
   • Traction will increase.

   Bad Weather & Night Driving · Answer: B · Official handbook: Texas Commercial Driver License Handbook (DL-7C), Section 2 – Driving Safely, p. 56

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