If you are driving in a 20 mph zone or where a 20 mph speed limit applies, you must not exceed 20 mph. The speed limit is the maximum legal speed, not a target, and you may need to drive more slowly because of pedestrians, cyclists, parked vehicles, schools or other hazards.
You cannot legally exceed the limit simply to overtake another vehicle, keep up with traffic or complete a manoeuvre more quickly. You should always obey the speed limit and choose an even lower speed when the conditions make this necessary.
Quick Self-Test
You’re driving in a 20 mph zone. When may you exceed 20 mph?
A) When overtaking
B) When the road is clear
C) When keeping up with traffic
D) Never