ADI Hazard Perception Theory 2

Question 1

The stopping distance at 70 mph in dry conditions is approximately:

Accepted Answer

75 m (245 ft)

Answer

At 70 mph the total stopping distance is approximately 96 m (315 ft), comprising 21 m thinking distance and 75 m braking distance — the length of more than six car lengths.

Question 2

Which situation at a junction requires an ADI to teach the concept of 'effective observation'?

Accepted Answer

Emerging onto a major road with restricted sight lines — look, assess, look again and move only when safe

Answer

Effective observation at restricted junctions involves looking right, left and right again (and for one-way roads, left-right-left), reassessing continuously before committing to the manoeuvre.

Question 3

What makes the crest of a hill particularly hazardous from a hazard perception standpoint?

Accepted Answer

Oncoming vehicles and pedestrians are hidden beyond the crest, requiring reduced speed to a safe stopping distance

Answer

A hill crest cuts off the driver's view of the road ahead; hazards on the other side may not be visible until very close, requiring speed to be reduced so the driver can stop within the distance they can see to be clear.

Question 4

In hazard perception theory, a 'latent hazard' differs from a developing hazard in that:

Accepted Answer

It is a situation that has potential to develop into a hazard but has not yet done so

Answer

A latent (or potential) hazard is a situation that could develop — such as a ball bouncing near the road or a parked van obscuring a junction — requiring monitoring but not yet demanding action.

Question 5

How does tiredness affect hazard perception and what should a driver do?

Accepted Answer

Tiredness slows cognitive processing and reduces the ability to detect and respond to hazards; the only cure is sleep

Answer

Fatigue impairs attention, slows reaction time and reduces hazard detection ability; opening a window or turning on the radio provides only minutes of relief; the only real remedy is stopping and sleeping.

UK ADI Theory Practice Test

UK ADI Theory Practice Test

ADI Hazard Perception Theory 2