Safety Margins

What is the stopping distance for a car travelling at 30mph in dry conditions?

• A12 metres
• B23 metres✓
• C36 metres
• D53 metres

Answer: At 30mph, stopping distance is 23 metres (9m thinking + 14m braking). This must be remembered for the theory test and demonstrates why safe following distances are essential in towns.

What is the stopping distance for a car travelling at 60mph in dry conditions?

• A23 metres
• B53 metres
• C73 metres✓
• D96 metres

Answer: At 60mph, stopping distance is 73 metres (18m thinking + 55m braking). Notice how stopping distance increases dramatically with speed, and doubling speed more than triples the stopping distance.

What is the stopping distance for a car travelling at 70mph in dry conditions?

• A53 metres
• B73 metres
• C96 metres✓
• D110 metres

Answer: At 70mph, stopping distance is 96 metres (21m thinking + 75m braking). This is almost the length of a football pitch, demonstrating why safe following distances are critical on motorways.

Why does stopping distance increase significantly in wet weather?

• AYour tyres are lighter when wet
• BReduced friction between tyres and road surface doubles the braking distance✓
• CThe engine works less efficiently
• DYour visibility improves

Answer: Wet roads reduce tyre grip dramatically, roughly doubling braking distance. This is why the rule 'double your following distance in rain' is important—your brakes are much less effective.

What is the two-second rule for following distances?

• AStay 2 seconds behind the car in front at all speeds
• BIt applies only on motorways
• CIdentify a fixed point, count 'one thousand and one', 'one thousand and two'—if you pass it before finishing, you're too close✓
• DIt means 2 metres of space

Answer: The two-second rule provides a safe following distance at any speed by using time rather than fixed distance. This automatically adjusts for your speed—at higher speeds you cover more distance in two seconds.

How should you adjust your following distance in icy conditions?

• AUse the normal two-second rule
• BUse a ten-second rule or much greater distance✓
• CFollow closely so you can brake with the car ahead
• DDon't follow anyone—drive alone

Answer: On ice, braking distance can increase tenfold, so you should increase your following distance to 10 seconds or more. This gives you vastly more space to stop if the car ahead brakes suddenly.

You're driving behind a large truck on a motorway. What should you be aware of?

• AYou can follow more closely because the truck is slower
• BYou have a longer view of the road ahead than normal
• CYour view ahead is blocked and you cannot see hazards, plus spray and debris make it dangerous✓
• DTruck drivers can see you easily in their mirrors

Answer: Being behind a truck means you cannot see hazards ahead, spray obscures vision, and the truck's sudden braking could cause a crash. Keeping back further and not following trucks closely is safer.

At what speed should the two-second rule be applied?

• AOnly at 20mph or below
• BOnly on motorways
• CAt all speeds on all roads✓
• DOnly in good weather

Answer: The two-second rule applies at all speeds because it scales with your speed—at higher speeds you cover more ground in two seconds. It's a universal safety principle.

Why is a larger safety margin important when driving on country roads?

• ATo allow more time to admire the scenery
• BBecause hazards like bends, livestock, and parked vehicles may appear suddenly✓
• CBecause country roads have no traffic
• DTo save fuel

Answer: Country roads have hidden hazards around bends, pedestrians, animals, and farm machinery that appear unexpectedly. Larger margins give you time to stop safely.

What should you do when visibility is very poor due to fog?

• AMaintain your normal speed and distance
• BUse full beam headlights
• CReduce speed significantly and increase following distance✓
• DAssume other drivers can see you clearly

Answer: In fog, you cannot stop within visible distance at normal speeds, so reducing speed and increasing following distance is essential. Full beam in fog causes reflection and is counterproductive.

Why should you increase your safety margin when driving at night?

• ADarkness makes other drivers more cautious
• BYour headlights only illuminate so far ahead, limiting reaction time✓
• CFewer vehicles are on the road
• DNight driving is safer than day driving

Answer: Headlights have a limited range, so you cannot see hazards far ahead, requiring more braking distance. This means a larger safety margin is needed than in daylight.

You're approaching a hill at 50mph. What safety margin should you maintain?

• AThe normal two-second rule
• BA larger margin because you cannot see over the hill✓
• CNo margin—go faster to get over it
• DDepends on the colour of the sky

Answer: Cresting a hill reduces your visibility ahead, so you should increase your safety margin to cope with unseen hazards like stationary vehicles or breakdowns on the other side.