Truck Weight Station Procedures
Weight stations are a routine part of trucking operations. Understanding the procedures, knowing your bypass options, and being prepared for inspections keeps you moving efficiently and violation-free. Whether you are grossed out at 80,000 lbs or running light, this guide covers everything you need to know about weigh stations.
Ahmad Qazi
Founder & CEO, O Trucking LLC
Fact-Checked by O Trucking Dispatch Team
5+ years dispatching and ensuring driver compliance at weigh stations nationwide
Written by Ahmad Qazi, founder of O Trucking LLC, drawing on 9+ years dispatching for owner-operators. Learn more about us.
O TruckingTruck Weight Station Procedures Guide (2026)
Key Takeaways
- Open weigh stations are mandatory for CMVs over 10,001 lbs GVWR unless a bypass device clears you; closed stations can be passed.
- A routine weigh takes 1-5 minutes: roll on slowly, stop, and watch for the green (go) or red (pull in) signal.
- PrePass uses a windshield transponder; Drivewyze is app/ELD-based — both bypass at most stations and reward good CSA scores.
- Overweight fines scale with severity, from about $100 for minor to $5,000-$16,000+ plus out-of-service for 10,000 lbs over.
- Skipping an open weigh station is illegal and usually triggers a full Level 1 inspection at the next stop.
- Weigh at a CAT Scale before the station so you already know your axle and gross weights.
What to Expect at a Weigh Station
A typical weigh station visit involves driving slowly onto the scale platform, stopping briefly while your weight is recorded, and then receiving either a green signal to proceed or a red signal to pull around for further inspection. The entire process takes 1-5 minutes for a routine weigh:
Approach at low speed — Follow posted speed limits on the scale approach. Typically 5-15 mph. Shift to a low gear and idle onto the scale.
Position on the scale — Some scales weigh one axle at a time (weigh-in-motion); others weigh all axles simultaneously. Follow the signage and line markings.
Watch for the signal — Green means proceed through. Red or a pull-around sign means park in the inspection area. Do not ignore a red signal.
Weigh Station Bypass Options
Bypass systems save time by allowing qualifying trucks to pass open weigh stations without stopping:
PrePass
Transponder-based system mounted on windshield. Communicates with scale systems as you approach. Green = bypass, red = pull in. Costs $15-20/month. Available at over 900 sites in 49 states. Carriers with good CSA scores get higher bypass rates.
Drivewyze
App-based bypass system that works through your phone or ELD. No hardware needed. Available at over 800 sites. Uses GPS to detect approaching weigh stations and sends bypass decisions to your device. Pricing varies by ELD integration.
PrePass vs. Drivewyze at a Glance
| Feature | PrePass | Drivewyze |
|---|---|---|
| Hardware | Windshield transponder | None — app or ELD only |
| How it connects | RF transponder at the scale | GPS / cellular through your device |
| Best for | Busy interstate fixed stations | Software-only fleets, mobile sites |
| Bypass eligibility | Both depend on your carrier's CSA safety scores and clean inspection history | |
No bypass device is a substitute for staying legal on weight. Know your axle weight limits and review overweight truck penalties before you load.
Overweight Penalties by Severity
| Overweight Amount | Typical Fine Range | Additional Consequences |
|---|---|---|
| 1-2,000 lbs over | $100-$500 | Warning or fine; CSA points |
| 2,001-5,000 lbs over | $500-$3,000 | Fine; possible offload required; CSA points |
| 5,001-10,000 lbs over | $2,000-$8,000 | Fine; offload required; out-of-service likely |
| 10,000+ lbs over | $5,000-$16,000+ | Severe fine; out-of-service; possible criminal charges |
Skipping a Weigh Station Is Never Worth It
Inspection Levels at Weigh Stations
Level 1 — Full Inspection
The most thorough inspection. Inspector checks all driver documents, crawls under the truck to examine brakes, suspension, frame, and steering components, and inspects the entire vehicle. Takes 30-60+ minutes. Any critical violations result in out-of-service orders.
Level 2 — Walk-Around
Inspector examines visible vehicle components and all driver documents without going under the vehicle. Takes 15-30 minutes. Checks lights, tires, leaks, load securement, and driver credentials.
Maintain Your Truck and You Will Pass Inspections
The Bottom Line
Weight stations are a normal part of trucking. Being prepared, knowing your weights, having bypass systems, and maintaining your truck and documents makes the process routine. For more on weight compliance, see our how to avoid overweight truck guide and our grossed out glossary entry.
Weight Station FAQ
Common questions about truck weigh station procedures
Do all trucks have to stop at weigh stations?
In most states, all commercial motor vehicles (CMVs) with a gross vehicle weight rating (GVWR) over 10,001 lbs must stop at open weigh stations unless they have a bypass device (PrePass or Drivewyze) that clears them. Some states have different thresholds. Bobtail trucks, even without trailers, are generally required to stop because the tractor's GVWR exceeds 10,001 lbs.
What happens if you skip a weigh station?
Bypassing an open weigh station without a valid bypass device is illegal and can result in significant fines ($250-$5,000+ depending on the state), points on your CDL, and CSA score violations. Law enforcement may pursue you and issue citations. In some states, skipping a weigh station is grounds for a full Level 1 inspection at the next opportunity.
What is PrePass and how does it work?
PrePass is a weigh station bypass system that uses a transponder mounted in the truck's windshield. As you approach a weigh station, the transponder communicates with the scale's system. If your carrier has a good safety record and your weight is within limits based on previous weighs, you receive a green light to bypass. A red light means you must pull in. PrePass costs approximately $15-20 per month per truck.
What do inspectors check at weigh stations?
At a basic weigh station stop, inspectors check your weight on the scale. If you are pulled in for inspection, they may check your driver's license and CDL, medical card, ELD/logbook, vehicle registration, insurance, permits, and conduct a vehicle safety inspection (Level 1, 2, or 3). Level 1 is the most thorough, including crawling under the truck to check brakes and suspension.
Do you have to stop at a weigh station if it is closed?
No. You only have to stop at weigh stations that are open and have lit signs or signals directing you in. A closed weigh station with dark signs or a 'Closed' sign can be passed without stopping. When a sign reads 'Scales Open' or its lights are flashing, all required commercial vehicles must enter unless a bypass device clears them.
Is PrePass or Drivewyze better for weigh station bypass?
PrePass uses a windshield transponder and works at the most fixed weigh stations, making it a strong fit for trucks running busy interstate corridors. Drivewyze is app-based with no hardware and often integrates with your ELD, which suits drivers who want a software-only setup and broader mobile-inspection coverage. Many fleets use both. Bypass rates for either depend on your carrier's CSA safety scores.
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