Four-Arms

Cycling can be treacherous, especially here in London, where the cyclist has to be aware, in control, and visible to all. Taking one's arms off the handle bars to indicate to the left or right whilst weaving through traffic and dodging the people getting off a bus where there's no bus stop is just plain crazy.

To resolve this problem let me introduce the Four-Arms. This is an attachment that can be worn like a rucksack or clipped onto a backpack. It has two life size arms that when dormant rest around your waist. When indicating to other drivers that you are about to turn left/right, the cyclist flicks a switch on the handlebars and the corresponding arm extends, hand open. The cyclist is then free to control the vehicle more precisely with both arms whilst signaling to drivers of his motionward intentions.

The arms can be configured to give a tight squeeze when inactive to create the sensation of a traveling companion behind you holding on (perhaps a saucy partner (with no torso, head or legs) for instance).

The fingers can also be remotely adjusted to a set of predefined configurations to give thumbs up showing appreciation to conscientious drivers; in order to convey gang hand-signs for blending in in rough neighbourhoods whilst avoiding potholes; or in the case of someone shouting "Nice one Four-Arms!" they can be set to flip them the proverbial finger.

Both arms can be extended if you want to look like a no-hands cycling maverick.

Unsure whether to make the arms mechanical, or have a cheaper version that works on an inflation/deflation system (but then you get no half-extras).