HTA Section 73(3)'s window-tint rule for the windows beside the driver's seat is framed around a specific test. What is it?

Correct answer: C. Whether the tint substantially obscures the vehicle's interior when viewed from outside

Section 73(3) doesn't set a percentage darkness limit directly — it prohibits coloured or reflective coating that "substantially obscures the interior of the motor vehicle when viewed from outside the motor vehicle." The test is whether someone outside the car can still see in, not just whether the driver can still see out (which is Section 74's separate concern).

Source: MTO Driver's Handbook: Highway Traffic Act, Part VI (Equipment) — Section 73(3), coloured or reflective window coating