I’m not sure if it is my failing hearing, or eyesight or the engine noise or just the wind whipping around (or possibly the pretty girl that just waved) but I often forget to turn my blinkers off.
So, I got this idea that if I could hear the blinker, I would be reminded and perhaps safer. Radio Shack sells these small buzzers for about $4 each. Get two and hook one up to each side and it buzzes at the same time that the blinker flashes. I hooked mine up to the little left and right side lights on the dash. Hide them under the dash. Pretty loud and annoying. Just right.