Motorcoach Speed Limiter: Is One Required and Should You Fit One?

No US federal rule requires a motorcoach speed limiter, and the two Canadian provinces that make US trucks run at 105 km/h (65 mph) exempt buses: Ontario in its regulation, Quebec in its order as published in draft. So a tour bus or charter coach is limited only if its operator decides to be. Some do: a coach company told federal regulators in 2016 that it had run speed limiters on its buses for about ten years.

Is a speed limiter required on a motorcoach in the US?

No. In 2016 FMCSA and NHTSA proposed that heavy vehicles with a gross vehicle weight rating over 26,000 lb carry a speed limiting device. They withdrew that proposal effective July 24, 2025, along with FMCSA’s 2022 follow-up notice.

The notice defines the vehicles by weight, not by body type. If you want to know whether your coach would have been in scope, check its gross vehicle weight rating plate. It no longer matters for compliance, because the rule is gone.

The agencies also wrote that the withdrawal has no effect on the ability of operators to limit the speed of their own vehicles if they choose. See truck speed limiter law in the US for the full picture.

Do coach operators already use speed limiters?

Some do. In the same Federal Register notice, the agencies summarize comments on the 2016 proposal. Coach USA supported a 68 mph limit and said that, as of December 2016, it had used speed limiters in its bus fleet for about 10 years, set to 68 mph. That is one operator’s statement, reported by the agencies, not a figure for the industry. It does show a large coach fleet treating a cap as normal practice years before any rule was proposed.

Our post on speed limiters for buses and coaches covers how limiters are used on coaches in other markets.

Do Ontario and Quebec require speed limiters on buses?

No, and this is a common mix-up for US operators who run cross-border charters.

• Ontario requires a 105 km/h (65 mph) limiter on commercial motor vehicles built after December 31, 1994, with an electronic control module and a gross vehicle weight rating of 11,794 kg or more. The regulation that sets out the exemptions, O. Reg. 396/08, lists “a bus” first among the vehicles exempt from the requirement, along with ambulances and fire apparatus. It also says the cap must be set at 105 km/h on the engine control module or by an equally effective system the driver cannot deactivate in Ontario.
• Quebec applies the same 105 km/h figure to heavy vehicles assembled after December 31, 1994 with a rating of at least 11,794 kg. The Minister of Transport’s order, as published in draft in the Gazette officielle du Quebec on October 29, 2008, excepts emergency vehicles, tool vehicles, buses, trailers and vehicles used for personal purposes. Check the current text of the order before you rely on it.

Both rules mainly catch trucks. Neither makes a US coach fit a limiter to cross the border. If you also run trucks into Ontario or Quebec, they are a different matter, covered in our guide to trucks and the Ontario and Quebec rules.

Why would a coach operator fit a limiter anyway?

Three reasons that hold up without a rule behind them.

Speed is a large share of deaths. NHTSA’s Speeding: 2024 Data (DOT HS 813 823, July 2026) counted 11,288 deaths in speeding-related crashes in 2024, 29% of all US traffic deaths. It also notes that stopping distance quadruples when speed doubles. A coach is heavy and carries many people, so the energy involved is high.

Night and weekend driving carries more speeding. The same NHTSA report found 22% of drivers in fatal crashes were speeding at night, against 16% in the day, and 22% on weekends against 17% on weekdays. Charter and tour work often runs at both times. These are figures for all drivers, not coach drivers, and we do not claim otherwise.

Fuel. The Department of Energy says gas mileage usually decreases rapidly at speeds above 50 mph. EPA SmartWay’s driver training fact sheet says a heavy truck driving 65 mph instead of 55 mph can use up to 20% more fuel. That is a truck figure, so treat it as a guide for any heavy vehicle, not a coach measurement. The EIA’s weekly diesel average was $6.35 a gallon in the week of October 26, 2026. You can test your own coaches in our US fuel price data and calculator.

What is the duty of care argument?

An operator that carries passengers for hire decides how it manages speed, and nobody else sets that policy for it. A sealed limiter set by the fleet owner is a documented control the operator can point to. With TrackSpeed, which combines a limiter and GPS tracking in one device, you also have a record of where the coach actually went.

We are a manufacturer, not a law firm. Ask your own counsel and insurer what evidence they value. We do not publish insurer discounts.

How does a limiter work on a coach?

It stops the engine being asked for more power once the coach reaches the set speed. Brakes and steering are untouched, and the driver has full control below the cap. Units are sealed and set by the fleet owner, and they work on the throttle signal or fuel line, not through the OBD diagnostic port.

Coach	Unit
Electronic throttle (drive-by-wire)	DBW speed limiter
SENT throttle sensors	SENT speed limiter
Mechanical fuel control	System 80
Cap plus GPS tracking	TrackSpeed
Lower speeds in terminals and yards	GeoKontrol 2

Any coach with an electronic (drive-by-wire) throttle takes the DBW unit, whatever the maker; older coaches with mechanical fuel control take System 80. The choice between an engine setting and a sealed aftermarket unit is explained in speed governor for trucks, and the same logic applies to coaches.

Frequently Asked Questions

Are speed limiters required on tour buses and motorcoaches in the US?

No. FMCSA and NHTSA withdrew their heavy vehicle speed limiter proposal on July 24, 2025, and said operators can still limit their own vehicles.

Do Ontario and Quebec require speed limiters on buses?

Ontario’s O. Reg. 396/08 exempts a bus from its 105 km/h requirement. Quebec’s order on heavy vehicles excepts buses and emergency vehicles, according to its published text.

What speed do coach companies set their limiters at?

It is the operator’s decision. One large operator told federal regulators it had used 68 mph on its buses for about ten years as of December 2016.

Can a coach limiter use different speeds in different places?

Yes, with GeoKontrol 2. It applies lower limits inside zones you define, such as a terminal or yard.

Can a driver change the cap on a sealed limiter?

The unit is sealed and set by the fleet owner, so drivers cannot change it. Below the cap, the driver has full control.

How do US fleets buy AutoKontrol speed limiters?

Through Scorpion, our parent group’s US team. Start with the quote form, and fitting is agreed per job, by your own technicians or our engineers and partners.

Decide your speed policy before a crash does

Nobody requires you to cap your coaches, which means the policy and the proof are yours to build. Tell us what you run and how many vehicles, and we will match a limiter to each one and price it. Get a quote or book a free consultation. How US fleets buy is set out on our US speed limiters page.

AutoKontrol has made speed limiters in Britain since 1985 and supplies fleets in more than 50 countries, with approvals including ISO 9001, UTAC, TÜV and VCA.