ADI Hazard Perception Theory

Question 1

In the context of hazard perception, a 'developing hazard' is defined as:

Accepted Answer

A potential hazard that is changing and will require the driver to take action

Answer

A developing hazard is a situation that is actively changing (e.g. a car pulling out, a pedestrian stepping off the kerb) and which will require the driver to take action such as braking or steering.

Question 2

What is the relationship between speed and stopping distance?

Accepted Answer

Stopping distance increases with the square of the speed — doubling speed quadruples stopping distance

Answer

Because kinetic energy is proportional to the square of velocity, doubling speed quadruples the kinetic energy and therefore the braking distance (though thinking distance doubles).

Question 3

Which factor has the greatest effect on a driver's reaction time?

Accepted Answer

Alcohol, fatigue or drug use

Answer

Alcohol, drugs (including prescribed medication) and fatigue all significantly increase reaction time; even small impairments extend thinking distance substantially at any speed.

Question 4

What technique should ADIs teach to help pupils identify emerging hazards when driving on rural roads?

Accepted Answer

Scan well ahead, use the road geometry to predict hidden hazards and adjust speed accordingly

Answer

Reading the road geometry (curves, crests, hedgerows limiting vision) and scanning far ahead allows a driver to anticipate hidden hazards and adjust speed before they develop into emergencies.

Question 5

What does 'commentary driving' help develop in learner drivers?

Accepted Answer

Their hazard perception and verbal articulation of risk identification

Answer

Commentary driving requires the pupil to narrate what they see, assess and plan, developing the habit of consciously scanning and identifying hazards and giving the ADI insight into the pupil's thought process.

DVSA UK Driving Theory Practice Test

DVSA UK Driving Theory Practice Test

ADI Hazard Perception Theory