That is mad, I would have thought big red road markings should be the very least Bristol Council should have put in place, what a great revenue scheme they have!! I will pay it if I have to, I mean my car is a great dirty diesel, but I was totally lost and never drive through bristol i ended up taking a wrong turn too, through an estate, didn't have a clue where I was , 3 am in the morning I just wanted to get to the 24hour costa coffee on the eastbound m4, I got there (in the end) and made it home safe.