Updated 10/8/2026
Have you ever noticed that speed limit signs in Oregon have different posted limits for trucks and buses?
The state does this to reduce both the likelihood and severity of crashes involving these heavy commercial vehicles.
Large truck and bus operators who drive faster than the speed limit that applies to them could be at fault if that decision leads to a crash. This is true even if the posted limit for other drivers is higher than the speed the truck or bus is traveling at when the crash happens.
Here’s what you need to know about the speed limit for trucks in Oregon and how it may affect your personal injury claim.
What’s the Speed Limit for Trucks and Buses in Oregon?
ORS 811.111 outlines the speed limits for trucks and buses in Oregon, which include:
- Motor trucks with gross vehicle weight ratings (GVWRs) of more than 10,000 pounds
- Truck tractors with GVWRs of more than 8,000 pounds
- School buses and activity vehicles
- Worker transport buses
- Church buses transporting children
- Any non-profit passenger-for-hire vehicles
The appropriate speed limit for these vehicles depends on the road. A posted sign may set that speed limit at:
- 55 mph on some interstate highways
- 60 mph on some open rural highways
- 65 mph on some interstates and open rural highways
Generally, the speed limit is higher in parts of eastern Oregon, where the population is less dense, such as a section of I-84 east of The Dalles.
If there is no posted sign with a higher limit, then trucks and buses usually have a maximum speed limit of:
- 15 mph in alleys or narrow residential streets
- 20 mph in school zones and business districts
- 25 mph in residential areas
- 55 mph on any highway
Understanding Oregon’s Basic Speed Rule
Despite these speed limits, Oregon also has a basic speed rule under ORS 811.100 that states all motorists must always drive at a speed that is reasonable and prudent based on factors such as:
- Other traffic on the road
- Road conditions
- Hazards at intersections
- Weather and visibility
- Any other relevant conditions
ORS 811.108 specifically says that the basic speed rule applies even if ORS 811.111 establishes a higher speed limit. Drivers also cannot exceed posted speed limits, even if they think it’s reasonable and safe.
Why Do Trucks and Buses Have Lower Speed Limits?
No matter the vehicle, speeding in general can make collisions more severe.
The Oregon Department of Transportation (ODOT) reports that the 3,360 speed-related accidents in the state from 2019 to 2023 are associated with about 25 percent of the fatal and serious injury collisions during that period.
The data also shows that higher speed limits correlate with greater injury severity. Once posted speed limits reach 45 mph or higher, there are very few minor or possible injuries, resulting in more serious and fatal crashes.
Trucks and buses have lower speed limits for the simple reason that their substantial weight makes them more of an accident risk, especially when it comes to:
- Stopping distance – These heavy commercial vehicles have longer stopping distances than lighter passenger vehicles. According to the Federal Motor Carrier Safety Administration (FMCSA), large trucks and buses can require the length of two football fields to stop safely. The faster the driver is going, the harder it is for them to react and stop in time.
- Force in collision –The FMCSA explains that fully loaded tractor-trailers can weigh up to 80,000 pounds, often making them 20 to 30 times heavier than passenger vehicles. That weight means trucks impart far more force in a collision, and higher speeds mean even more energy transfers to the smaller car.
Oregon’s lower speed limits for heavy commercial vehicles give drivers more time to respond and help reduce the force of an impact when a crash does occur.
Can Speeding Affect Truck or Bus Accident Liability?
A truck or bus driver traveling above the speed limit or simply too fast for conditions may be at fault if that negligence leads to a collision.
However, commercial drivers are not the only parties that could be liable for a speed-related crash. Other potentially liable parties might include:
- The driver’s employer, if they encourage the driver to break the speed limit to make deliveries faster
- Other road users whose unsafe behavior contributes to a crash
- A third-party mechanic who fails to make necessary repairs, such as fixing a broken speedometer or worn brakes
- The manufacturer of a defective component that causes the driver to speed unintentionally
How Can a Truck Accident Lawyer at Rizk Law Help After a Speed-Related Crash?
If you were recently injured by a speeding truck in Oregon, you’re probably dealing with severe, life-altering injuries.
You may have the right to compensation, but you should focus on your recovery, not on navigating the complex legal system.
That’s what the team at Rizk Law is for. While you get treatment, we can:
- Recover critical evidence to prove the truck or bus was speeding, such as telemetry data and readouts from the vehicle’s onboard computer systems
- Independently investigate the accident to determine if anyone other than the commercial driver was to blame
- Identify at-fault parties and file claims to pursue all potential sources of compensation
- Calculate the financial and personal costs of your injury to understand what fair compensation looks like for you
- Negotiate aggressively for a fair settlement that covers all your losses without having to go to trial
- File a lawsuit and present your case in court if the other side won’t make you a fair offer
At Rizk Law, our team can provide a unique level of local experience and insider knowledge.
We’re an Oregon law firm, owned by an Oregonian, based right here in Portland with lawyers and staff who all live nearby.
We have spent over 25 years helping injury victims in the city and throughout the state, giving us in-depth experience with Oregon courts, judges, and adjusters and well-developed relationships with a network of experts.
Our senior lawyer also trained at major insurance companies in the 1980s and 90s, so we’re deeply familiar with their tactics and can prepare for whatever defense they may throw at us.
High-speed truck accident cases tend to involve catastrophic damage and significant losses. When that much money is on the line, insurers often try to avoid blame to reduce or deny what they have to pay.
Still, our experienced attorneys have recovered millions on behalf of injured Oregonians, including a $1.25 million trial verdict for a pedestrian hit by a commercial motorist.*
As one of our happy clients says:
“Jacqueline was terrific. Made it so easy! Took care of all the intricate details, great communication, and I got a higher settlement than I was expecting. Do yourself a favor and let her handle your case for you!”
– KB MERCER
Contact Our Experienced Personal Injury Attorneys Today
Were you hurt in a speed-related trucking accident in Oregon? If so, you need the help of an experienced Portland truck accident lawyer who knows how to prove what happened, who’s responsible, and how much they owe you.
Contact Rizk Law today for your free consultation to learn more.
*Each case is unique, and past results do not guarantee future outcomes.
Sources:
Oregon Department ofTransport: Speed Zones
