Home / Alberta / Questions / Rules of the Road Rules of the Road Report Replace tires when tread reaches: A 0.5 mm B 1.5 mm C 3 mm D 5 mm Show Answer & Explanation Correct Answer: B. 1.5 mm Below, hydroplaning risk. Previous Next More Rules of the Road Questions Hand signal right turn: Hand signal for stop: Hand signal left turn: Motorcycles: In exit lane: Often Missed All Alberta Questions Smart Practice Mock Exam Road Signs Guide