they were saying :
Irrelevant. They're the figures for cars in the dry. You extend them and-or slow if the road conditions or your vehicle dictate.
Umm, why? If a f***ing great big concrete block appears in front of your car, panic braking is EXACTLY what you need... Why do you think new cars have ABS and many now have EBA?
Sure, you don't treat the brakes as binary in normal driving - but then, I've never once had this mythical concrete block appear in front of me.
Do you ever look out of your windscreen? If it's 80deg in the shade, you don't need to drive as if you're on ice. There won't be any.
Tailgating through traffic lights 5152Yes, that is right. But to be safe that is what you need. As i said, panic braking is to be avoided, and in the weyt or on ice, you won't achive your...
Car one has slightly under the HC (over-estimated) braking distance. They are likely to hit the wreckage, but at a far lower speed, buttuming they can't swerve round it.
Car two has damn near twice the HC braking distance. They are very unlikely to hit anything, even buttuming they can't swerve round the wreckage.
This is, of course, buttuming that everybody is alert and leaving a sufficient gap - in all lanes.
With your recommended gaps, it's true - nobody will hit anything. There will be approximately one third of a mile between this mysterious sudden concrete block and the third car.
Your seven second gap at 60mph gives a density of 10 cars per mile per lane, at 70mph 7.3 cars, and at 80mph 5.6 cars per mile per lane. Can you see how quickly the country will grind to a halt?
Yes.
They don't obey the current (sensible) two second recommendation. Extending the recommendation to 1 sec per 10mph (nearly 220m at 70mph, nearly 290m at 80mph) will help that *how* much?
