Stopping (and estimating stopping distances)
I can describe the factors that affect stopping distance and explain the effect of each one.
Stopping (and estimating stopping distances)
I can describe the factors that affect stopping distance and explain the effect of each one.
Lesson details
Key learning points
- Stopping distance is the distance travelled both as a drive reacts and then for the brakes to bring a vehicle to a stop
- Reaction time of a drive can be affected by tiredness, drugs, alcohol or distractions
- Braking distance can be affected by adverse road and weather conditions and the condition of the vehicle
- When braking, work is done on the brakes that heats them up
- If brakes overheat they can stop working effectively and lead to a loss of control
Common misconception
Pupils often forget to include thinking distance in the overall stopping distance, or imagine that thinking distance is too short to matter.
Model a situation in which a child steps out from behind a parked car 10 m in front of a driver. At 20 mph the thinking distance is about 6 m and braking distance 6 m; at 30 mph these are 9 m and 14 m.
Keywords
Reaction time - for driving is the time between noticing a hazard and taking an action to deal with it
Thinking distance - is the distance a vehicle travels while a driver reacts; the vehicle does not slow during this time
Braking distance - is the distance a vehicle travels between the brakes being applied and the vehicle coming to a stop
Stopping distance - is the sum of the thinking and braking distances
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
6 Questions
Exit quiz
6 Questions
reaction time -
time between noticing a hazard and taking an action to deal with it
thinking distance -
distance a vehicle travels during the time a driver takes to react
braking distance -
distance a vehicle travels before stopping after brakes are pressed
stopping distance -
sum of the thinking and braking distances