Automatic turn signals for bikes?
I've tried them. Not bright enough (The ones available are not exactly NiteRider tail light bright!) to be seen in most cases, especially during the day. The wiring harnesses are a pain to fasten to the bike, and are too lightweight to take the abuse. The units themselves don't take abuse well, either! The battery life...stinks!!
I wish they did have really good turn signal setups available...hand signals are difficult, if not, at times, impossible to sustain long enough in motion without risking going out of control and falling. (Not something you want to do at rush hour!). Lights will work from the time you turn them on, until you turn them off.