Home / Alberta / Questions / Rules of the Road Rules of the Road Report Full Class 5 driver suspension threshold: A 8 B 10 C 15 D 20 Show Answer & Explanation Correct Answer: C. 15 Threshold is 15 for non-GDL; GDL is 8. Previous Next More Rules of the Road Questions Before backing up: School crossing guard stop paddle: Alberta winter tires: Divided highway with median, stopped school bus opposite side: School bus amber (yellow) flashing lights: Often Missed All Alberta Questions Smart Practice Mock Exam Road Signs Guide