Stopping Distances

Define stopping distance

Total distance travelled from when the driver spots the hazard until the driver completely stops the vehicle

What is the equation for stopping distance?

Stopping distance = thinking distance + braking distance

Define thinking distance

Distance travelled between the moment the hazard is spotted until the moment the driver applied the brakes

What is the equation for thinking distance?

s = ut

s = thinking distance, m

u = initial velocity, ms^-1

t = reaction time, s

What factors affect thinking distance?

• Alcohol/drugs

• Tiredness

• Vision/visibility

• Music/distractions

• Caffeine

• Initial speed

Define braking distance?

Distance travelled between the moment the brakes are applied until the moment the vehicle stops

How do you workout braking distance?

u² / 2a

u = initial velocity, ms^-1

a = deceleration, ms^-2

What affects braking distance?

• Weather conditions

• Road conditions

• Heavy load

• Tyre traction/bald tyres

• Damaged brakes

• Initial speed