Home / Alberta / Questions / Road Signs Road Signs Report A yellow diamond with circular arrow pattern: A One-way loop B Roundabout ahead — yield on entry C Detour D No U-turn Show Answer & Explanation Correct Answer: B. Roundabout ahead — yield on entry Yield to traffic already in roundabout. Previous Next More Road Signs Questions A school bus extending its red stop arm: Freeway exit numbers correspond to: Before entering a tunnel you should: A yellow diamond with curve + speed number: A 'Keep Right' of divider sign: Often Missed All Alberta Questions Smart Practice Mock Exam Road Signs Guide