Astraist wrote:
1. Increase gap to make allowances for the differences between different vehicles (and their maintenance and drivers) since the differences in stopping distances sharpen as the conditions deteriorate
2. Make allowances for the following driver to avoid being rear-ended
In heavy rain and surface water the difference in stopping distance at 70mph between a car with 7mm of tread and one with 1.6 in (from memory) in the order of 10m. And that is before the impact of braking/suspension differences come into play.
One also has to consider the human factor, some people simply press the pedal harder than others, and some will in wet conditions make greater allowance (in terms of not pressing so hard) as others.
One also needs to consider the need to increase distances to immobile hazards were the doubling is quite unambiguously needed[...]The risk of collision is greater in the wet than the dry - it seems logical and prudent that distances should increase in some proportion to the risk of the vehicle in front being involved in a collision.
ROG wrote:If following another at the same speed on the same surface then there is no logical reason to increase the gap
For objects going at a slower rate (or stationary) then the distance does need increasing
IVORTHE DRIVER wrote:Stationary objects? If you are too close and the engine drops out of the vehicle in front can you get round it?
vonhosen wrote:http://www.rospa.com/roadsafety/info/tyre_tread_depth.pdf
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