Worst Road in London

So where are the best roads? Where are the best downhill-smooth-wind-behind you places? I can only think of north from Highbury Park where it becomes Blackstock Road. Good Hill. Plenty of visibility so you're not so worried about death at 40 mph.

The ride to Cambersands had some fast downhills that were straight and clear unlike the shitty roads to Brighton. Also, the last ride to Dunwich was on super smooth roads. In London? Not a fucking chance.