stopping distances for_cars
TRANSCRIPT
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Stopping distances for Stopping distances for carscars
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Know your speed limits – fill in the missing speeds
?
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Built up area
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Single lane highway
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Dual two-lane highway
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Dual carriageway is
ending
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Expressway
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Stopping distances
Thinking distance is the distance a car travels before the brakes are applied.
Braking distance is the distance a car travels whilst the brakes are being applied.
Stopping distance = thinking distance + braking distance
Stopping distance
Braking distance
Thinking distance
How long does it take a moving vehicle to stop?
The stopping distance is the sum of the thinking distance and the braking distance.
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Braking distance
The distance the car travels The distance the car travels during its deceleration, whilst during its deceleration, whilst the brakes are being appliedthe brakes are being applied
The distance the car travels in the split second between a hazard
appearing and the driver applying the brakes
Thinking distanceThinking distance
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The total stopping distance = thinking distance + breaking
distance
30mph
9m + 14m = 6 car lengths
50mph
15m + 38m = 13 car lengths
70mph21m + 75m = 24 car lengths
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Thinking distanceThinking distanceIt is affected by 3 main things:1. How fast you are going2. Being wide awake – drugs,
tiredness, alcohol, carelessness and old age.
3. Visibility – rain, oncoming lights, fog and the night.
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Braking distance
It is affected by 4 main factors:
1. How fast you are going
2. The mass (or load) of the vehicle
3. If the car is poorly maintained – brakes and tyres (groves in tyres – 1.6mm deep)
4. The grip of the road surface – on a wet road you can skid twice as long
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Why is this illegal?How will this affect your stopping
distance?
Bald tyres make stopping distances shorter on dry roads, Why
A bald tyre has more contact on the road and therefore more friction!
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What about aquaplaning ?
• On a wet road, tyre treads channel water out from between the tyre and the road
Removing the water away from the tyre and the road
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What about aquaplaning ?
• Bald tyres allow a thin layer of water to stay between the tyre and the road, reducing friction
Why do racing drivers change their tyres when it is wet?
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Can you match up the words with their definitions?
Stopping distance
Friction
Thinking distance
Braking distance
One of forces the road exerts on the tyres as the car is stopping.
The distance a car travels whilst it is braking.
The distance a car travels before the brakes are applied.
The sum of thinking distance and the braking distance.
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What factors affect braking and thinking distance?
Thinking distance Braking distance
Speed of car
Speed of car Speed of car
Road conditions
Road conditions
Drugs and alcohol
Drugs and alcohol
Tiredness
Tiredness
Medication
Medication
Condition of tyres
Condition of tyres
Condition of brakes
Condition of brakes
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Stopping a car…
Braking distance
Too much alcohol
Thinking distance
Tiredness
Too many drugs
Wet roads
Driving too fast
Tyres/brakes worn out
Icy roads
Poor visibility