PrePass is the most reliable, widely utilized weigh station bypass system in North America. There are PrePass-equipped sites across every corridor north to south, east to west and hundreds of places in between.

With PrePass, pre-cleared vehicles can continue at highway speeds without having to stop. PrePass not only saves fleets time, fuel and money, but it helps create greater efficiencies for shippers and supports improved safety for all highway users.

Through PrePass, over a half million commercial vehicles from qualified fleets are electronically pre-screened for compliance with federal and state safety and credential requirements. Within seconds of approaching a PrePass-equipped inspection facility, PrePass’ electronic pre-screening quickly lets drivers know if they’re cleared to stay on the road and bypass the truck scales at highway speed, or if they need to pull in.

Technology That Works. Every Time.

The small plastic transponder box on PrePass equipped trucks might look simple at first glance, but the technology inside is the best in the industry.

That’s because PrePass operates with an Advance Vehicle Identification (AVI) reader and vehicle in-cab transponder platform. No other data transmission model can replicate the data accuracy and transmission speed of the transponder system. For weigh stations not equipped with transponder readers with strong cellular connectivity, PrePass includes the MOTION mobile application. This combination of transponder and bypass app means you leverage the most opportunities to bypass weigh stations.

A photo of Collin Stewart, President of Stewart Transport

My company depends on the time and fuel savings HELP's PrePass provides, and my drivers view pre-clearance as a real benefit that makes them more efficient. Therefore, PrePass is a great recruiting tool. In fact, many drivers ask us if we offer PrePass early in the interview process.

- Collin Stewart, President, Stewart Transport, Inc.

MOTION™ Bypass App

PrePass customers can expand their ability to bypass weigh stations with the MOTION bypass application. Available on Apple iOS, Android and select telematics devices, the MOTION app uses cellular signals to enable bypassing where RFID transponder readers are not installed. The PrePass transponder and bypass app together provide the reliability benefits of RFID with the coverage benefits of cellular technology. The MOTION app is an added benefit of PrePass service.

Compare Our Solutions

Good Better Best
Technology MOTION app on tablet or telematics device Transponder on windshield MOTION app with Transponder
Connectivity Cellular network Radio Frequency Identification (RFID) Cellular and RFID
Performance 81.5% to 93.9% when cell coverage is good 99.9% 99.9%
Locations Available at all PrePass sites* Available at PrePass and third-party sites** with readers Available at all PrePass and third-party sites
  • Location coverage
  • Bypass rates
  • Third-party sites
  • Toll payment service
  • Location coverage
  • Bypass rates
  • Third-party sites
  • Toll payment service
*Excluding Iowa **NORPASS and Oregon Green Light

How PrePass Transponders Work

PrePass states have placed signs on the highway alerting vehicles that they are approaching a PrePass-equipped weigh station. As with all weigh stations, trucks are required to be in the right hand lanes. At some locations, there will be two lanes available for bypass, but trucks must remain prepared to stop in the event that they don’t get a green light.

A diagram ofPrePass Weight Station Bypass System

About a mile before a PrePass-equipped weigh station, a PrePass truck is identified through communication between the in-cab transponder and the Advanced Vehicle Identification (AVI) reader.


The PrePass system automatically checks the truck’s safety and credential clearance status. The system also checks the truck’s weight to ensure that it is compliant with the jurisdiction’s regulations.


Based on a truck’s clearance status, the PrePass system sends a signal to the truck’s transponder, which notifies the driver of the screening result both visually and audibly. A green light indicates a bypass and a red light indicates that the driver must pull into the weigh station.


To help maintain system integrity, some PrePass trucks are randomly selected and receive a red light, requiring them to pull into the weigh station where a carrier’s compliance can be confirmed.


A roadside bypass compliance reader identifies when any non-compliant truck fails to pull into the weigh station.


A truck’s bypass screening signal will continue to flash for approximately 15 minutes after passing the weigh station. This valuable feature provides confirmation of the vehicle’s bypass status for both the driver and enforcement.

PrePass Weigh Station Bypass Benefits


PrePass customers save at least 5 minutes with each successful bypass. As a result, PrePass customers have gained over 65 million hours of productive driver time by reducing weigh station stops.


PrePass customers save nearly one half gallon of fuel per bypass. To date, PrePass customers have saved over 300 million gallons of fuel since we began compiling data in 1997.

Drivers Love It.

Avoid congestion near weigh stations and cut risks from merging into and out of traffic.


Carrier’s data in the PrePass Credentialing Database is confidential. All carrier bypassing data is purged after 90 days.


PrePass has been cited as one of the most desirable benefits for drivers. Carriers utilizing PrePass experience enhanced driver recruitment and retention success.


An FMCSA report calculates a savings of at least $8.68 per bypass. PrePass carriers have saved more than $5.7 billion in operational costs since 1997.


Transponders and the MOTION app are provided free to customers, with no minimum use requirements.