Ontario MTO Truck Knowledge Practice Test 2025 – The Comprehensive All-in-One Guide to Exam Success!

The presumed unlawful limit for blood alcohol concentration in Ontario is actually .08. This limit is established as the threshold at which a driver is considered impaired under the Criminal Code of Canada. If a driver's blood alcohol concentration is at or above this level, they can be charged with driving while impaired, regardless of whether their driving was actually affected by alcohol.

A .05 concentration is associated with a “warn range” under Ontario's zero tolerance and graduated licensing programs, which leads to administrative penalties rather than criminal charges. Levels of .02 and .10 do not represent the established legal thresholds for impairment in Ontario. However, they pertain to different contexts of driving rules, thereby making .08 the critical number for presumed unlawful limits.