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Question:

You are on a good, dry, road surface. Your brakes and tyres are good. What is the typical overall stopping distance at 40 mph?

A 36 metres (118 feet)
explanation

Stopping distances are affected by a number of variable factors. These include the type, model and condition of your vehicle, road and weather conditions, and your reaction time. Look well ahead for hazards and leave enough space between you and the vehicle in front. This should allow you to pull up safely if you have to, without braking sharply.