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The width requirements are the federal requirements which outline the national policies.
These regulations apply to all users of the National Network.
State laws. A state cannot impose a width limitation of more or less than 102 inches on a vehicle operating on the National Network. However, a state can grant special use permits to motor vehicles, including manufactured housing, that exceed 102 inches in width.
Safety devices. Safety devices, as defined in 658.5, 658.16, and Appendix D to Part 658, or as determined by the states as being necessary for the safe and efficient operation of motor vehicles are not to be included in the calculation of width.
Devices not included in 658.5 cannot extend beyond three inches on each side of a vehicle.
No safety device should be capable of carrying cargo.
Exceptions. The State of Hawaii is allowed to keep its 108-inch width maximum.
The width limitations described do not include the special mobile equipment or width exclusive devices defined in 658.5, excluded by 658.16 or Appendix D to Part 658, or which the Department of Transportation Secretary may interpret as necessary for safe and efficient operation of commercial motor vehicles, except that no excluded device can be designed or used for carrying cargo.