The pucture is part of a car journey I did today. I travelled east on the A2 then joined the M25 and travelled south. I thenpassed under a sign which said something like "You must pay the DartCharge by midnight tomorrow". It was a bit confusing because I'm not familiar with the area. However, I've now looked it up and I think the sign must have been aimed at drivers who'd used the Dartford Crossing, which us north of where I joined the M25. Am I correct?