Driving theory book · Road safety
Speed
This chapter helps you understand the key principles of speed.
Chapter summary
This chapter gives you an overview of:
- Adjust your speed to visibility, road conditions, traffic and the vehicle's condition. The speed limit is the maximum permitted speed, not necessarily a suitable speed.
- Reaction distance increases in proportion to speed.
- Braking distance increases approximately with the square of speed. Doubling speed makes braking distance about four times as long.
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