Home / Alberta / Questions / Road Signs Road Signs Report A green-painted bike box at intersection: A Any vehicle may stop B Motor vehicles must stop behind it C Reserved for buses D Reserved for left turns Show Answer & Explanation Correct Answer: B. Motor vehicles must stop behind it Motor vehicles must stop before the bike box. Previous Next More Road Signs Questions Flashing hand with countdown means: A 'Pavement Ends / Gravel Ahead' sign: A 'No U-turn' sign: A 'No Left Turn' sign: A 'No Right Turn' sign: Often Missed All Alberta Questions Smart Practice Mock Exam Road Signs Guide