Like the Olympic games, Boris Johnson needs a physical legacy to remind us all of him once he's gone.
Unfortunately, his plans for a living bridge, a second Blackwall tunnel and a Thames Airport are unlikely to happen soon, if at all.
So with both time and money short, Boris has to take his opportunities where he can.
And here we have the first part of Boris's physical legacy to London, a revolutionary new design of er... pedestrian crossing.
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Based on crossings in Tokyo, the new design stops traffic in all directions, allowing shoppers to cross diagonally in an "X" as well as straight ahead.The £5m junction is able to handle double the number of pedestrians and ease overcrowding at the busy intersection.It will be officially unveiled at 0945 GMT by London Mayor Boris Johnson.In homage to its Far Eastern inspiration, the mayor will strike a two-metre high cymbal as Japanese musicians play taiko drums.A giant X, in the form of 60m (196ft) of red ribbon will then be unfurled by devotees of cult Japanese Manga characters dressed in colourful costumes.Mr Johnson said the crossing, controlled by traffic lights, was "a triumph for British engineering, Japanese innovation and good old fashioned common sense".
Now the crossing and ceremony sounds great and all, but if Boris really wanted inspiration for this, then he didn't need to travel all the way to the Far East.
In fact just a short journey down to the Near South would have done as well.