Washington CDL — General Knowledge practice
Washington CDL — General Knowledge: Traffic Laws practice test
Speed limits, turning and signaling rules, headlight and seat-belt requirements, and the everyday laws every driver must follow.
Content reviewed against official driver handbooks · August 12, 2026
14 questions · pass with 11 correct. You get instant feedback and an explanation after every answer.
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12 sample Traffic Laws questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
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1. Your commercial vehicle is in a collision that injures someone or causes damage of $1,000 or more. How long do you have to file a state Vehicle Collision Report?
Correct answer: Within 4 days
If a collision causes injury or damage of $1,000 or more, you must file a state Vehicle Collision Report within 4 days.
Source: Washington CDL Guide — Section 1: Introduction (Accident reporting)
2. Under the property-carrying hours-of-service rules, how many hours may you drive after 10 consecutive hours off duty?
Correct answer: 11 hours
A property-carrying driver may drive a maximum of 11 hours after taking 10 consecutive hours off duty.
Source: Washington CDL Guide — Section 1: Introduction (Hours of service)
3. Without a special permit, what is the maximum legal height, including the load, for a vehicle in Washington?
Correct answer: 14 feet high
No vehicle, counting its load, may stand more than 14 feet high.
Source: Washington CDL Guide — Section 1: Introduction (Height)
4. During which period each year must vehicles over 10,000 pounds carry tire chains when required for such vehicles?
Correct answer: From November 1 through April 1
Chains must be carried on vehicles over 10,000 pounds GVWR from November 1 to April 1, or whenever else chains are required.
Source: Washington CDL Guide — Section 1: Introduction (Tire chains)
5. On a two-lane highway, at what point must a slow-moving commercial vehicle pull off at the first safe turnout?
Correct answer: When five or more vehicles are delayed and cannot pass
When five or more vehicles are stacked up behind you and cannot pass, you must pull off at the first safe turnout.
Source: Washington CDL Guide — Section 1: Introduction (Slow vehicle rule)
6. In Washington, what is the maximum allowable gross weight for any combination of vehicles?
Correct answer: 80,000 pounds
The maximum gross weight for any combination of vehicles is 80,000 pounds.
Source: Washington CDL Guide — Section 1: Introduction (Weight)
7. Unless a sign shows otherwise, what is the maximum speed for trucks and buses on city and town streets?
Correct answer: 25 mph
On city and town streets the top speed for trucks and buses is 25 mph unless posted lower.
Source: Washington CDL Guide — Section 1: Introduction (Speed limits)
8. Unless a special permit allows otherwise, how wide may a commercial vehicle and its load be on Washington roads?
Correct answer: No more than 8 1/2 feet, which is 102 inches
No vehicle, with or without its load, may be wider than 8 1/2 feet, which equals 102 inches.
Source: Washington CDL Guide — Section 1: Introduction (Width)
9. A property-carrying driver may not drive after being on duty how many hours in 7 consecutive days?
Correct answer: 60 hours
You must not drive after reaching 60 hours on duty in any 7 consecutive days.
Source: Washington CDL Guide — Section 1: Introduction (Hours of service)
10. On a limited-access road with three or more lanes in your direction, where may a vehicle over 10,000 pounds NOT drive?
Correct answer: In the left-hand lane, except when preparing to turn left
A vehicle over 10,000 pounds may not use the left-hand lane except when preparing for a legal left turn at an intersection, exit, or driveway.
Source: Washington CDL Guide — Section 1: Introduction (Left lane rule)
11. Unless otherwise posted, what is the maximum speed for a truck or bus on county roads?
Correct answer: 50 mph
On county roads the top speed for trucks and buses is 50 mph unless a lower limit is posted.
Source: Washington CDL Guide — Section 1: Introduction (Speed limits)
12. When driving a heavy vehicle or combination, which lane should you normally travel in?
Correct answer: The right lane, except when turning left or passing
Heavy vehicles should stay in the right lane except when getting ready to turn left or when passing another vehicle.
Source: Washington CDL Guide — Section 1: Introduction (Right lane rule)
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Every Washington question is written from the official Washington driver handbook and checked against its current edition. DMV Test Free is a free, independent study resource — not affiliated with any DMV or government agency. About DMV Test Free