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This is why motorcycling is awesome, and especially why lane-splitting is awesome. This is 100-percent legal in the UK. Just think of how much time this dude saves himself. 
If you are in the United States (with the exception of California), think of how much you are missing out because pro-motorcycle groups are wasting all their time and money whining about helmet laws. They are failing to lobby for the legitimate advantages of motorcycling.