Purchase a transponder

Find out how to purchase a transponder for a commercial vehicle, which allows the vehicle to be electronically screened and enables the driver to bypass weigh stations.

Transponder benefits

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


Transponders must be registered to a VIN with the commercial vehicle information used for electronic screening coming 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.

Purchasing a transponder

Transponders are out of stock.

  • Checks used to purchase transponders will be returned.
  • We do not have an expected delivery date.
  • To be notified when transponders are available, send a request to TransponderAdmin@wsdot.wa.gov.


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 transponders purchased from us to WSDOT.
  • Follow your regional guidelines for lithium ion batteries when disposing a transponder.

8,683 animals crossed the Snoqualmie Pass East Project area

as recorded by WSDOT and partners in 2020 and 2021.

46% increase in Amtrak Cascades ridership to 251,000 passengers

in 2021 compared to 172,000 in 2020.

Nine wetland and stream mitigation sites across 32.7 acres added

to our monitoring program in 2021 to help offset climate change impacts.