What Are the Speed Limits in Ontario?

Under Ontario's Highway Traffic Act, speed limits are set based on road type. If no speed limit sign is posted, the default limits apply automatically. Many new drivers are not aware of these defaults, which can lead to unintentional speeding. The following table summarizes Ontario's speed limits by road type:

According to the Ontario Ministry of Transportation, the speed limit on most 400-series highways (401, 400, 404, QEW, 403, 407, 410, 427) is 100 km/h. Some sections have been increased to 110 km/h, with the higher limit clearly posted. Driving significantly above the posted limit (50 km/h or more over) triggers stunt driving charges, which carry an immediate 30-day licence suspension and 14-day vehicle impoundment.

School zones in Ontario are typically posted at 40 km/h, though some municipalities set them at 30 km/h. These reduced limits are active during posted hours, usually from 8:00 AM to 5:00 PM on school days. Community safety zones are designated areas where speeding fines are doubled. They are often located near schools, hospitals, and residential areas. Watch for signs marking the beginning and end of these zones.

Speeding penalties in Ontario escalate based on how far over the limit you are driving:

On the G2 and G road tests, driving too fast or too slow can both result in errors. Examiners expect you to drive at the posted speed limit when conditions allow and to adjust your speed appropriately for traffic, weather, and road conditions. Driving more than 10 km/h below the posted limit without a valid reason (such as weather or traffic) can be marked as impeding traffic flow. Exceeding the speed limit, even briefly, is an automatic fail on the road test.