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Stopping distance
Less traction on a wet road so the stopping distance increases.
On the freeway maintain 3 seconds follow distance If the road is slippery or wet adjust your distance to
gravel
you skid
gravel
gravel
It depends on road and vehicle conditions. Under dry ideal conditions always maintain a 2 second interval. If it is wet double the distance, and if it is snow triple that distance. On icy roads stay home.
6 to 8 seconds
When you got bad conditions like regular tyres on an icy road, or bald tyres on a wet road.
Your vehicle will not grip the road as under normal conditions. You must reduce the speed, increase the safety distance from other vehicles and reduce the torque on your wheels by driving in the highest gear possible for your speed.
To grip the road surface. You need tread especially in wet conditions.