Buy a transponder

Learn how to buy a transponder for a commercial vehicle, a tool that allows the vehicles to be electronically screened and  lets eligible drivers bypass weigh stations.

WSDOT weigh station transponder

Commercial vehicle drivers or carriers with a gross vehicle weight of 16,000 lbs or more can buy a transponder to be electronically screened as the commercial vehicle approaches a weigh station. E-screening allows safe and legal carriers to bypass weigh stations after checking criteria such as the legal weight/height, safety rating and registration information.


Transponders are registered to a VIN and the e-screening system uses the commercial vehicle information from the registration/cab card.

  • The commercial vehicle registration/cab card must be current.
  • An active USDOT number must be provided (Carrier Responsible for Safety).
  • All required taxes and fees must be paid.

Buy a transponder

Step one: Get a transponder application

To get a transponder application, you can either:

Step two: Mail in your application with a check

  • Complete the application.
  • You can use one application to purchase multiple transponders mailed to the same address.
  • Send a check or money order to WSDOT for the total cost of the transponder(s) purchased.
  • (Optional) Register the transponder(s) by including a copy of the registration/cab card for each commercial vehicle.
  • We are unable to accept credit cards or any form of electronic payment.

Send checks or money order to:

Washington State Department of Transportation
Attn: Cashier
310 Maple Park Avenue SE
PO Box 47305
Olympia WA 98504-7305

After your application and payment are processed, we mail out transponders and you should typically receive your order in the mail within 7-10 business days of the check clearing. The transponder is registered if it has a license plate sticker attached or you’ve received a list of assigned transponders and plates with your order. Applications without registration/cab cards will have transponders mailed unassigned.


We charge a one-time $35 fee per transponder.

  • When you receive the transponder, it belongs to you. You own the transponder.
  • There are no additional fees for using a transponder in Washington.

Battery life

  • Transponders have a 3 to 5-year average battery life (depending on use).
  • Transponders do not have replaceable batteries.
  • Once the transponder stops working, you will need to purchase a new transponder.
  • Do not return non-working WSDOT issued transponders to us.
  • Follow your regional guidelines for lithium ion batteries when disposing a transponder.

Slow down – lives are on the line. 

In 2023, speeding continued to be a top reason for work zone crashes.

Even one life lost is too many.

Fatal work zone crashes doubled in 2023 - Washington had 10 fatal work zone crashes on state roads.

It's in EVERYONE’S best interest.

95% of people hurt in work zones are drivers, their passengers or passing pedestrians, not just our road crews.