Canada on a US Licence — Metric Signs & Quebec's Winter-Tyre Law

For an American driver, Canada is the most familiar foreign country there is: same side of the road, same wide lanes, automatic rentals, signs you can mostly read. That familiarity is also the trap, because the handful of things that are different are easy to drive straight past — and one of them is on every speed sign you see.

The signs are metric. A motorway posted at 100 km/h is about 62 mph, a rural 80 is roughly 50 mph, and a town 50 is around 31 mph. None of that is a slow zone; it is the normal limit in different units, and it is enforced by fixed cameras and patrols. Set your mental conversion early, because drifting 20 km/h over can cost CAD 100-300, and a casual 10 km/h over still runs CAD 50-100 (≈ €35-70).

The second blind spot is winter. Quebec requires winter tyres on every car from 1 December to 15 March — and that law applies to your rental. An all-season tyre, which most American renters never think to check, is simply not legal in the province during that window. British Columbia adds the same requirement on designated mountain highways from October. If your trip touches those areas in the cold months, confirm the car is properly shod before you drive off.

On documents, Canada is easy: your US licence is valid for visitors and no IDP is needed, the State Department says. Bring proof of auto insurance (US cover is accepted for tourists) and keep your passport and rental agreement handy for border and roadside stops.

Where Canada quietly diverges from home is impaired driving. The headline limit matches the US at 0.08, but every province layers administrative penalties that bite at 0.05 — instant roadside suspension, the car sometimes impounded, all before any court date. Treat the limit as zero. The other adjustment is scale: distances dwarf most US road trips, fuel stations thin out on the long routes, and signal drops, so keep the tank above half and load offline maps. Fuel is about CAD 1.25/litre and the emergency number is 911.

See the provincial breakdown on our Canada driving guide, check requirements with the Driving Permit Checker, and price a ticket with the Speeding Fine Calculator.

Sources

• U.S. Department of State, Country Information, Canada (“U.S. driver’s licenses are valid for visitors, and proof of auto insurance is required. U.S. auto insurance is accepted for tourists.”), last updated August 11, 2025: cadataapi.state.gov