Very often along the Old Shoreham Road because (s)he is turning right at the Holmbush roundabout!! Some people think they need to be in the outside lane 5 miles before their turn-off, regardless of whether there is anything in the inside lane....or not:confused:
But if the right hand lane didn't empty, and the two lanes filtered one after the other at the end of the queue, there would be no pushing in, the length of the tailback would be halved and everyone would be happy. Oh, and if people stopped leaving such big gaps the tailback would be even shorter!!