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Theory-test visual trainer

Learn NI stopping distances visually.

Pick a speed, estimate the total stopping distance and reveal the Northern Ireland Highway Code figure. Then use quiz mode until the numbers are automatic.

CAR
Thinking
Braking
Thinking distance9 m
Braking distance14 m
Total stopping distance23 m

Quick practice

At 30 mph, what is the typical total stopping distance?

Official NI figures

Typical dry-road stopping distances from the Highway Code for Northern Ireland.

20 mph6 m thinking6 m braking12 m total
30 mph9 m thinking14 m braking23 m total
40 mph12 m thinking24 m braking36 m total
50 mph15 m thinking38 m braking53 m total
60 mph18 m thinking55 m braking73 m total
70 mph21 m thinking75 m braking96 m total
Conditions change everything. The Highway Code says the following gap should be at least doubled on wet roads and increased further on icy roads. Wet-road stopping distances can be at least double dry-road distances.
Source: The Highway Code for Northern Ireland, rule 126 · Checked 21 September 2026.