The Commercial Drivers License (CDL) Study Guide



Maximum legal lengths are:

  • A single motor vehicle, except certain municipal transport buses, is 40 feet.
  • School buses and auto stages is 46 feet and includes front and rear bumpers.
  • A single vehicle or trailer in a combination, with or without load, is 53 feet.
  • Double trailer combinations canít exceed a total of 61 feet for the combined length of the trailers.
  • Truck and trailer combinations or log truck and stinger-steered pole trailers canít exceed an overall length, with or without load, of 75 feet.

The above limitations do not apply to vehicles transporting poles, pipes, machinery, or other objects of a structural nature that canít be dismembered and are operated by a public utility when required for emergency repair of public services facilities or properties.

Loads may not extend to more than 15 feet behind the center of the last axle or more than three feet beyond the front bumper.

Any loads extending beyond the sides or more than four feet beyond the rear of the vehicle must have the extremities of the load marked with either 12-inch red flags or red lights.

If visibility is poor, red lamps and reflectors are required.

When hauling objects such as poles or logs you must place a red light at the most extended point of the load. This light must be a combination light visible from both the back and sides.


Width Height Weight Special Permits

You can click on the safety tips for more information.

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