Have you ever tried getting into Beckenham from the south? It's a joke... I have to go through Croydon which is a one-way city where normal road suddenly give you a single sign's notice before turning into a bus lane. I went through 4 'cos the roads were packed and ya have to concentrate on the road ahead, behind and to the sides, the buses, the trams, the pedestrians and the road surface all at once.
Nightmare!
Plus because everything is all one-way there's only a few entrances and exits from Croydon so if you miss it you have to head to the next one and muddle your way around the outside which usually ends up with you taking a wrong turn and going back onto the one-way again.
A journey that shoulda taken me 45 mins MAX took 2.5 hours the first time and I missed my time slot at the bike shop for my warranty work.