District Of Columbia cdl Double - Test 1
Number of questions: 20
Passing score: 80%
Acceptable number of errors: 4
This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. To pass, the applicant must answer at least 16 questions correctly. Each question has four possible answer choices. Test questions come from the Washington D.C. Commercial Driver License Manual. Questions come from chapters covering: Driving Safely, Air Brakes (if applicable), Combination Vehicles and Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.
To DMV Handbooks1. If the low pressure warning light comes on while you are driving:
Braking will only be possible if there is still enough air in the tanks.
You can apply the brakes 14 times before the air in the system runs out.
You should continue to drive normally and check the brake system when it is convenient.
You should stay at least 100 feet away from other vehicles.