What Is Weigh Station Bypass in Trucking?
Also called: PrePass, Drivewyze, Weigh Station Bypass Service
A weigh station bypass service lets an eligible truck skip an open weigh station without stopping. PrePass and Drivewyze are two such services. A transponder or an app sends the truck's details to the station before it arrives. If the carrier's credentials and safety record check out, the driver gets a green light to bypass. A red light, or no signal, means the driver must pull in.
Last reviewed September 23, 2026 · Facts checked October 16, 2026
Key Points
- A bypass service checks a truck's eligibility as it nears an open weigh station and sends a green or red signal to its transponder or app (PrePass)
- Green means bypass. Red, or no signal, means pull in
- Eligibility depends on the carrier's safety record and credentials, such as its Inspection Selection System (ISS) score, active USDOT registration, operating authority, IRP and UCR fees and no out-of-service order
- At many stations, a truck is also weighed at highway speed. PrePass says this happens at over half of the stations it serves
- A green light does not guarantee you will not be stopped. Random pull-ins still happen, and some loads fall under a state's bypass restrictions
- Prices and plans vary by provider and change, so we do not state a price. Compare the current price to the time you expect to save
What is weigh station bypass?
A weigh station bypass service lets a truck skip an open weigh station if it qualifies. The goal is to save time and fuel for trucks that have a good safety record and legal credentials, and to let the state focus its inspections on trucks that need more attention. PrePass and Drivewyze are two services that offer it. Each state decides which stations take part and what rules apply. The service works with the state's own screening system.
How does a bypass service work?
You sign up with a provider and use a transponder on the windshield, a phone or tablet app, or both. As you near a weigh station, the system identifies your truck and checks your carrier's credentials and safety record against the state's rules. It then sends you a signal. A green light means bypass. A red light, or no signal, means you must pull in. At many stations, the truck is also weighed at highway speed, so a truck over the legal weight can be sent in.
Who qualifies for a bypass?
It depends on the provider and the state. Providers point to a carrier's safety score, an active USDOT registration, operating authority, current IRP and UCR fees and no federal out-of-service order. For weigh-in-motion stations, the truck must also be at legal weight. A carrier with many violations can lose bypass eligibility over time. Some states add their own rules. To check where you stand, look at your own safety record and credentials, and ask the provider.
Does a green light mean you will not be stopped?
No. Random pull-ins still happen, and an officer can always direct you into a station. Some states also restrict bypass for certain cargo, so a truck carrying that load must pull in even with a green light. A transponder that is mounted in the wrong place may not be read. Follow the signs and the officer's directions, and keep your paperwork in order. Our scale guide explains what scales and inspectors check.
Is a bypass service worth the cost?
It depends on how often you pass open stations and what the provider charges. Add up the price of the service, any fees for the transponder, and the time you expect to save. A driver who runs many scales a week may save a lot of time. A driver who rarely sees one may not. Ask providers for current prices and any added features, such as toll payment. Compare plans before you sign.
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Frequently Asked Questions
How does PrePass work?+
As your truck nears an open weigh station, PrePass checks its eligibility and sends a green or red signal to your transponder or app. Green means bypass. Red or no signal means pull in. At many stations the truck is also weighed at highway speed.
How much does PrePass cost?+
Plans and prices vary and change, so we do not state a price. Ask PrePass or another provider for the current price and compare it to the time you expect to save.
How do I get PrePass for my truck?+
Sign up with a provider, then install a transponder or use the app. You need active registration, operating authority and credentials in good standing, and a safety record that meets the provider's and the state's rules.
Can I be pulled in even with a green light?+
Yes. Random pull-ins still happen, and an officer can direct you into a station at any time. Some states also restrict bypass for certain loads.
Does PrePass work for tolls?+
PrePass offers a plan that combines tolls and bypass, called PrePass Plus. Check the provider's current plans and the roads it covers before you sign up.
Who qualifies for weigh station bypass?+
Providers look at a carrier's safety record and credentials, such as its ISS score, USDOT registration, operating authority, IRP and UCR fees, and any out-of-service order. For weigh-in-motion stations, the truck must also be at legal weight. States can add rules.
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This is industry terminology and typical practice. It is not legal or tax advice. Rates, fees, and rules mentioned are general ranges. Confirm the details on your rate confirmation, carrier agreement, or a current official source.