Most rural freeways throughout Ontario have a standard posted limit of 100 kilometers per hour. This speed is widely applied across many non-urban expressway sections within the province.

Rural undivided highways in Ontario typically have an 80-kilometer per hour limit. These types of roads often lack physical separation between opposing traffic, necessitating slightly lower speeds than divided highways or freeways.

On divided rural highways that are not designated as freeways, the typical speed limit is 80 kilometers per hour. This speed ensures safe operation, taking into account the possibility of occasional turns and crossings.

Ontario permanently increased the speed limit to 110 kilometers per hour on 10 additional highway sections. This decision followed earlier successful pilot projects and thorough safety evaluations.

In the absence of specific posted signs, Ontarios default speed limit in residential zones is 50 kilometers per hour. This applies unless local municipalities have enacted bylaws to reduce the limit for enhanced safety.

In Ontario, school zones typically feature reduced speed limits, generally falling between 30 and 40 kilometers per hour. These lower limits are crucial for protecting children during active school hours and when they are entering or leaving school grounds.

Reduced speed limits in school zones usually apply specifically on weekdays during designated school hours. This timeframe, typically from 8 in the morning to 5 in the evening, aims to maximize child safety when school is in session.

Children can suddenly enter the road without warning near schools, often without looking for traffic. Reduced speed improves a drivers reaction time and significantly lowers the chance of a serious collision, protecting vulnerable pedestrians.

The speed limit within truck inspection stations is set at a low 40 kilometers per hour. This reduced limit is essential for ensuring the safety of workers and vehicles operating in close quarters within the inspection facility.

Speed limit signs displayed in parking lots are generally not legally binding under Ontario law. While they serve as safety recommendations, they are not enforceable by traffic authorities as provincial highway limits are.

In Ontario, driving at 150 kilometers per hour or more is automatically considered stunt driving. This serious offense applies universally, even if the posted limit on a specific road, such as a freeway, is already high.

Drivers are legally required to reduce their speed when road or weather conditions are poor, such as during rain, snow, or fog. Simply following the posted limits is insufficient if visibility or traction is adversely affected.

The default speed limit in most built-up areas within municipalities is 50 kilometers per hour. While this is the general rule, municipalities retain the authority to lower this limit in specific zones like school areas or residential neighborhoods.