Before You Make Modifications to Your Vehicle…


December 31, 2015 by Minuteman Trucks

If you are planning on modifying your commercial vehicle, make sure you know the Federal Lighting Equipment Location Requirements. Before making any changes you should make sure those changes comply with the law. This includes adding mud flaps, additional equipment, plows, and anything that was not originally on the truck when purchased.

For the rear of the vehicle you must follow Federal Motor Vehicle Safety Standard 49 CFR 571.108 for mounting and visibility of brake lights, turn signal lights, and back up lights mounted on the rear wall of the truck.

The federal requirement states the lights need to be visible at a 45 degree angle left and right from a vertical plane and 15 degrees up and down from a horizontal plane. The diagram below shows the requirement outlined by FMVSS.


Overview of Federal Motor Vehicle Safety Standard No. 108

Lamps, Reflective Devices, and Associated Equipment – Passenger Cars, Multipurpose Passenger Vehicles, Trucks, Buses, Trailers, (except pole trailers and trailer converter dollies), and Motorcycles (Effective 1-1-68 for vehicles 2,032 mrn (80 or more inches) in width and Effective 1-1-69 for all other vehicles). This standard specifies requirements for original and replacement lamps, reflective devices, and associated equipment. Its purpose is to reduce traffic crashes and deaths and injuries resulting from traffic crashes, by providing adequate illumination of the roadway, and by enhancing the conspicuity of motor vehicles on the public roads so that their presence is perceived and their signals understood, both in daylight and in darkness or other conditions of reduced visibility.

Click here to view Table 1 of § 393.11—Required Lamps and Reflectors on Commercial Motor Vehicles

Click here to view a reference guide with diagrams from Truck Lite


One thought on “Before You Make Modifications to Your Vehicle…

  1. Darren says:

    Excellent share, good to know the safety standards when considering modification. I would be curious to know what are the more common enhancements truckers make to their vehicle, either for performance or asthetics?

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