The SportLight BIKE Light is a 3 in 1 device. $29.95.
1) LED lights for clear visibility in traffic up to 200 yards away.
2) Automatic turn indicators activated by leaning left or right.
3) Clearly marked sign identifies your mode of transport as a BIKE (so at all times you know exactly what you are riding).
Personally I reckon it should read ‘My other car’s a Humdinga’, but what do I know?