Which brings me to my next point: Perception is reality. If you flash your high beam, tap your brake light or turn on your turn signal, you need to consider how other motorists may interpret that. The California Department of Motor Vehicles suggests signaling 100 feet before turning, but if you signal too early, a motorist might misunderstand what you mean. For example, if there's a shopping center in the vicinity of an intersection, it's better to wait before signaling so a motorist won't think you're turning where you're not and pull out in front of you. On the flipside, forgetting to turn off your signal after you've completed your turn is inviting someone to cross your path. Make fun of Harleys all you want, but they have self-canceling turn signals for a reason.