The "little finger" gesture is meant to be given to speeders in lieu of other, more traditional fingers. Rather than anger or annoyance, it's meant to imply that the speeder...uh...has a small organ. While it sounds like an 8th-grade game and is clearly less effective when used at female speeders, it meets all the qualifications of a good driving gesture - quick, easy, widely understood (in Australia, anyway). And based on this article, effective.
Simon Jardak was fined $400 by a magistrate yesterday after an accusatory finger on the Anzac Bridge enraged him so much he threw a plastic bottle out of his car window, hitting the gesturing woman's car.
Jardak blamed his malicious damage charge on the RTA's anti-speeding campaign, in which hoons are mocked with wagging little fingers, suggesting they have tiny penises.
I'm a long-time wisher that there was a commonly-understood hand signal for "I'm sorry, dude - that was 100% my fault, and I recognize and acknowledge that." It would prevent so much anger on the highways and byways - frankly, I think a public awareness campaign in our country is in order. Now we just need a gesture to use. George Bush, if you're reading this, don't use the "index finger on the nose" for the apology campaign - it's already been assigned.