Which of these factors most affects your stopping distance?
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ANSWER
✓Your speed — doubling speed more than doubles stopping distance
The road surface only
The weight of your cargo
The age of your tires
Why: Stopping distance is affected by perception distance (how far you travel while noticing a hazard), reaction distance (how far you travel while applying the brakes), and braking distance (the distance to actually stop). Vehicle speed is the greatest single factor because doubling your speed more than doubles your stopping distance.