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CMV parts and maintenance - Washington

RegSenseTiresFleet SafetyState InfoCMV Parts and MaintenanceParts and Accessories - Motor CarrierBest ResultsFocus AreaWashingtonEnglishTransportation

The Washington State Patrol has adopted Part 393 of the Federal Motor Carrier Safety Regulations (FMCSRs), as it exists on October 1, 2023.

The Washington Utilities and Transportation Commission prescribes rules and regulations for household goods carriers, solid waste collection companies, and common carrier brokers in the state of Washington. The agency has adopted Part 393 of the FMCSRs, as in effect on December 31, 2024.

Part 393 applies to vehicles with a gross vehicle weight rating or gross combination weight rating or gross weight or gross combination weight of 10,001 or more pounds and vehicles transporting hazardous materials requiring placards.

Backup Alert DevicesA backup alert device or rear cross-view mirrors must be mounted on a truck with a cube-style, walk-in cargo box up to 18 feet long.
The backup alert device must warn the driver of the detection of a person or object at a minimum of six feet to the rear of the vehicle and encompass the width of the rear of the vehicle. A backup alert device is defined as any:
  • Motion detection device
  • Laser device
  • Camera or
  • Television device.

Rear cross-view mirrors are any type of mirrors which, when mounted, will allow the driver to view a minimum distance of six feet to the rear and encompass the width of the rear of the vehicle in order to be able to detect an object or person. The cross-view mirrors must be installed in a manner that will satisfy these requirements.
First Aid KitNo requirements
MudflapsAll motor vehicles, trailers, cargo extensions, and semitrailers shall be equipped with fenders, covers, flaps, or splash aprons adequate for minimizing the spray or splash of water or mud from the roadway to the rear of the vehicle.
All devices must be as wide as the tires behind which they are mounted and extending downward to at least the center of the axle.
TiresStudded tires - No tire may have blocks, flanges, cleats, spikes, or any other protuberances of any material other than rubber projecting beyond the tread surface.
Tire chains - Tire chains of reasonable size are allowed when required for safety because of snow, ice, or other conditions tending to cause a vehicle to skid.
When traffic control signs marked “chains required” are posted by the Department of Transportation, a vehicle or combinations of vehicles may not enter the controlled area without having mounted on its tires the appropriate type and number of tire chains.
A minimum of two extra tire chains must be carried on the vehicle in the event that road conditions require the use of more chains or the chains in use are broken or otherwise useless. On certain routes, from November 1 to April 1, a sufficient number of tire chains must be carried on the vehicle at all times. Additional information may be accessed via the Washington State Department of Transportation website:
https://wsdot.com/travel/real-time/mountainpasses/tiresandchains.
['CMV Parts and Maintenance']
['Tires', 'Parts and Accessories - Motor Carrier']
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