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Frequently asked questions

A transponder is a small electronic device that attaches to the inside of the vehicle’s windshield and allows trucks to bypass weigh stations by electronically verifying the legal weight, safety rating and credentials of the truck.
Yes. Complete the Transponder Transfer form and fax it with a copy of the vehicle registration/cab card to the number provided on the form.
No. Once a transponder has been purchased it is your property.
No. Removing the battery destroys the transponders memory.
Yes. Once a Transponder is purchased it is your property and can be registered for use in any NORPASS or PrePass jurisdiction as well as the Oregon Green Light system. Transponders registered with PrePass will be subject to PrePass regulations and fees.
It is not recommended. Having multiple transponders in a vehicle can prevent the correct one from being read.
No. NORPASS cannot register PrePass Transponders.
  • Near the center of the windshield
  • On the passenger side of a divided windshield
  • Either three inches from the top or just above the dash board
On average bypassing a weigh station saves 3-5 minutes.
  • Center the Vehicle in the Weigh In Motion (WIM) lane (if applicable)
  • Maintain a steady legal highway speed
  • Provide at least a three second gap between your truck and other vehicles
  • Secure tarps so the wind does not trip the over-height detector
  • Avoid dark metallic window tinting that can interrupt the transponder signal
  • Avoid metallic windshield visors that can interrupt the transponder signal
  • Use only one transponder in your vehicle
  • CB’s may cause an interruption of the signal to the transponder
  • Excessive speed
  • Change of speed
  • Following too close to another vehicle
  • Lane changes
  • Excessive braking prior to reaching the Weigh-In-Motion scale (if applicable)
Contact the Washington State Department of Transportation Transponder Administration at 1-888-877-8567.
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