CDL Doubles Triples Practice Test (2024)

1. You should be especially alert for drunk drivers:

2. As you approach off ramps and on ramps, remember:

that the posted speed limit may be safe for automobiles, but may not be safe for larger vehicles.
that braking and turning at the same time can be a dangerous.
All of the above.

3. When connecting to the rear trailer, the trailer height should be:

the same height as the fifth-wheel.
lower than the center of the fifth-wheel.
higher than the center of the fifth-wheel.

4. The tractor protection valve:

supplies air to the trailer air tanks.
controls the emergency brakes on combination vehicles.
keeps air in the tractor brake system should the trailer break away or develop a bad leak.

5. If during vehicle inspection a tire is too hot to touch, you should:

let air out.
remain stopped until the tire cools off.
immediately decrease air pressure.

6. Rough acceleration can cause:

damage electrical and brake lines.
tire damage.
mechanical damage.

7. Do NOT use the parking brakes:

when you leave your vehicle.
if the brakes are very hot.
when you park for less than two hours.

8. Fully loaded rigs:

are much more likely to roll over than empty rigs.
are less likely to roll over than empty rigs.
are just as likely to roll over as empty rigs.

9. When driving at night you should dim your lights when following another vehicle within:

10. A red triangle with an orange center means:

Law enforcement vehicle
The vehicle is hauling hazardous materials
Slow-moving vehicle

HI CDL DOUBLES TRIPLES PRACTICE TEST