Truck Speed Limits by State 2026
Speed limits for commercial motor vehicles vary significantly across the United States. Some states allow trucks at 80 mph while California caps them at 55. This guide provides the complete state-by-state reference for CMV speed limits, split speed limits, and hammer lane restrictions in 2026.
Ahmad Qazi
Founder & CEO, O Trucking LLC
Fact-Checked by O Trucking Dispatch Team
5+ years planning routes across 48 states with speed limit compliance
Written by Ahmad Qazi, founder of O Trucking LLC, drawing on 9+ years dispatching for owner-operators. Learn more about us.
O TruckingTruck Speed Limits by State 2026: Complete CMV Guide
Key Takeaways
- California has the lowest truck limit at 55 mph on all freeways, strictly enforced by CHP even where cars run 65-70.
- Texas, Utah, Wyoming and Montana allow the highest truck speeds, roughly 75-80 mph on rural interstates.
- Split-speed states (California, Oregon, Indiana, Ohio, Illinois and others) hold trucks below the car limit, often shown only on a smaller supplemental sign.
- Many states ban or restrict trucks from the left lane on highways with three or more lanes; a posted sign always overrides your GPS.
- A speed governor caps your top speed but does not change the legal limit — you still must slow to each state's posted truck limit.
- Excessive-speed convictions are serious violations under FMCSA rules and can disqualify a CDL for 60 days or more.
Sample Truck Speed Limits by State
This table shows maximum truck interstate speed limits for selected states. Always verify current posted limits as they change:
| State | Truck Interstate | Car Interstate | Split? |
|---|---|---|---|
| California | 55 mph | 65-70 | Yes |
| Oregon | 55-65 mph | 55-65 | Some roads |
| Indiana | 65 mph | 70 | Yes |
| Ohio | 65 mph | 70 | Yes |
| Texas | 70-80 mph | 75-85 | Some roads |
| Utah | 75-80 mph | 75-80 | No |
| Wyoming | 75 mph | 80 | Yes |
| Illinois | 65 mph | 70 | Yes |
| Georgia | 70 mph | 70 | No |
| Florida | 70 mph | 70 | No |
California's 55 MPH Truck Limit Is Strictly Enforced
Know the Limits Before You Cross the State Line
How Split Speed Limits Work
A “split” or differential speed limit means trucks and other heavy vehicles are held to a lower posted maximum than passenger cars on the same road. States adopt them because crash and stopping-distance research shows a loaded combination vehicle needs far more room to stop than a car. The catch for drivers is that the lower number is often not on the big white speed-limit sign — many states post the standard limit and use a smaller supplemental sign reading “TRUCKS” or “NIGHT” with the reduced figure.
Two patterns matter most:
- Statewide split (e.g., California): trucks are capped at one number — 55 mph in California — almost everywhere, regardless of the car limit. There is little ambiguity; the truck number simply follows you.
- Road-by-road split (e.g., Indiana, Ohio, Illinois, Michigan): the gap appears only on certain rural interstates, and the truck limit may be 5 mph below the car limit on one stretch and equal on the next. Watch the supplemental signs at every interchange.
Because limits change at the line and even within a state, treat the table above as a starting reference, not a substitute for posted signs. When you build a multi-state run, factor the slower segments into your trip time the same way you account for hours-of-service limits — padding the schedule for a 55 mph California leg is cheaper than a ticket or a missed delivery.
Left-Lane and Lane-Restriction Rules
Several states layer lane restrictions on top of the speed limit, and they trip up drivers who only watch the speedometer. Common forms include:
- Keep-right / pass-only laws: trucks may use the left lane only to overtake, then must return right.
- Outright left-lane bans on highways with three or more lanes in one direction — common around major metros and on designated truck corridors.
- Designated truck lanes on steep grades and a handful of toll roads where trucks are confined to the right one or two lanes.
The Sign Is the Law, Not the GPS
Why Truck Speed Limits Are Worth Respecting
Beyond avoiding a citation, running at the legal truck limit protects three things that are hard to get back: your CDL, your operating costs, and your safety margin. A serious-speed conviction stays on your record and is visible to carriers and insurers through CSA and PSP, and repeat offenses can disqualify you for 60 days or more under FMCSA rules.
There is also a real fuel argument. At highway speed, aerodynamic drag rises sharply, so every few miles per hour you cut typically saves measurable fuel — one reason so many fleets set governors below the legal maximum. If you own your truck, walk through the trade-off in our speed vs. fuel economy guide and the broader safe-speed guide. For the full picture on how tickets hit your license, see our breakdown of a CDL speeding ticket’s consequences.
Truck Speed Limits FAQ
Common questions about truck speed limits by state
What states have split speed limits for trucks?
Several states have split speed limits where trucks have a lower speed limit than passenger vehicles. Notable split-speed states include California (55 mph trucks vs 65-70 cars), Oregon (55 trucks vs 65 cars on some roads), Washington (60 trucks vs 70 cars on some highways), and Indiana (65 trucks vs 70 cars). Always check state-specific limits as they change.
What is the fastest truck speed limit in the US?
Texas and a few other western states have the highest truck speed limits, with some Texas highways allowing trucks up to 80 mph (though most interstates in Texas are 70-75 for trucks). Utah, Wyoming, and Montana also have relatively high truck limits of 75-80 mph on rural interstates.
What is the slowest truck speed limit in the US?
California has the lowest general truck speed limit at 55 mph on most highways, regardless of the posted speed for passenger vehicles. This 55 mph truck limit is strictly enforced and applies on freeways where cars may be traveling at 65-70 mph.
Can trucks use the left lane in all states?
No. Many states restrict or prohibit trucks from using the left lane (hammer lane) on highways with three or more lanes. Some states ban trucks from the left lane entirely; others restrict left-lane use to passing only. Violations can result in fines. Check each state's truck lane restrictions before assuming you can use the left lane.
Do truck speed limits apply if my truck has a speed governor?
Yes. A speed governor (limiter) caps your maximum speed, but it does not change the legal speed limit. If your governor is set to 68 mph and you enter California where the truck limit is 55 mph, you are still responsible for slowing to 55. Many carriers set governors at or below 65-70 mph as a fuel-economy and safety policy, but the posted state limit always controls. A federal speed-limiter rule for heavy trucks has been discussed for years — check the current status directly at FMCSA before assuming any nationwide cap is in force.
Are there minimum speed limits for trucks on the interstate?
Yes. Many interstates post a minimum speed (commonly 40-45 mph) and several states make it illegal to impede traffic by traveling unreasonably slow in the normal flow. On long mountain grades a fully loaded truck may legally drop below the minimum because it physically cannot climb faster, but you should use the right lane, hazard flashers when appropriate, and any posted truck-climbing lane. Sitting well under the flow on flat ground can draw an impeding-traffic citation.
How does a speeding ticket affect my CDL?
Speeding tickets are more serious for CDL holders than for regular drivers. A conviction for excessive speed (commonly 15 mph or more over the limit) is a serious traffic violation under FMCSA rules — two within three years can trigger a 60-day disqualification, and three can mean 120 days. Even smaller tickets raise your insurance and hurt your CSA/PSP record, which carriers and insurers review. Knowing the truck limit in every state you run is the cheapest way to protect your license.
Route Planning That Respects Speed Limits
Our dispatchers plan realistic schedules based on actual truck speed limits — not car limits. Safe, legal, and on time.