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The traffic management in the area is a typical traditional Westminster one-way maze, which not only means that drivers drive along streets faster because they don't expect other drivers to come their way, but also feel they need to make up time lost by the detours, and because it's not filtered, there are still ways through to everywhere for drivers. It's traffic management very firmly stuck in the Stone Age, but it won't change in the foreseeable future, because there are many businesses in the area that would be up in arms if their wealthy customers could no longer reach their premises by car.
@pastry_bot puts his finger on one of the crucial issues, which is arrangements for deliveries. I've long thought that rather than building more underground railways for people, underground railways for deliveries would actually be useful. You bring a shaft to the surface somewhere in one of those well-defined business districts that Central London has, e.g. Covent Garden, and have the goods ferried on to their final destinations by a fleet of cargo bike riders or foot messengers, and you immediately cut out a huge proportion of the car traffic in that sort of area. The areas concerned, like Covent Garden, are actually very small, and the 'last half-mile' deliveries would be quick and easy.
Often, on Q1 opposite Royal Opera, there are a number of commercial vehicles rat running. If you are going south they pull out of the side street to the left just before the filter bit. Today, with the view completely blocked by a parked lorry, a maniac just drove at full speed without looking. I saw a flash of colour to my left and braked but he nearly killed the guy behind me. Called him a cunt and so forth, but he just blankly stared ahead