This video is from the A206 Littlebrook Interchange at Dartford in Kent right next to the Dartford Crossing.
It highlights the need to be in front of a truck at any cost. As seen here, the truck enters the roundabout in the correct lane at the traffic lights and as the lights go green not one but three cars are in the wrong lane. The last of the three cars, the mini, is nearly t-boned by the truck as it drifts into his lane. Fortunately nothing happened and no doubt the car drivers drove away completely oblivious to anything.