Correct answer
Ten times the normal distance on a dry road.
Grip on ice can be extremely low and braking distance may reach ten times the normal distance on a dry road. This is a risk reference rather than a guaranteed distance: speed, ice conditions, tyres and the vehicle all matter. Reduce speed and greatly increase your following distance.
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Four times the normal distance on a dry road.
Twice the normal distance on a dry road.
Ten times the normal distance on a dry road.
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