Pete317 wrote:
And made worse by lack of attention, which means that by the time people realise that there's something going on up ahead they have little option but to brake hard.
On the drive home today I had the misfortune to see this in action only a few feet from my car. As usual, the M25 was being a bit stop start between junction 21a and 22. I'm in lane 2 trying to keep moving, leaving a reasonable gap and not accelerating hard each time the car in front moves. Suddenly I hear the unmistakable sound of a skid coming from my right and look in my wing mirror to see white van man number 1 in lane 3 closing far too quickly on white van man number 2, fronts locked up with smoke pouring off them, swiftly followed by a dull crunch as both white vans got knackered. I'd guess he needed another 5-10 metres to have stopped safely.
I was fortunate enough to be fractionally in front of the chaos this probably caused, otherwise my journey home would have been even more delayed. It did make me even more nervous of the large Renault HGV that was rather close behind me until I left the M25 though.