The capital's planned new river crossing faces opposition at every turn. Why has it always been so hard to find new ways across the Thames in East London?
The strangest part of London's planned inner Motorway Box - not just because it's nothing like the other three sides, but also because it actually got built.
A first step towards emissions-based road pricing, a pointless measure to enforce something that's happening anyway, or another leap forward in traffic planning from the people who created the Congestion Charge? It's hard to say.