Either a blinker volume that increases over time and is maybe also tied into ambient sounds or is adjustable (louder only) and/or seat buzzer for turn signals. You know, for the citizens that are becoming forgetful and hard of hearing, or others with the tunes up loud.. Had to remind my Dad all the time. They have tried to make driving safer every other way but missed this one. I put a seat buzzer under my motorcycle seat because the blinker dash light was not in my line of sight and I forgot it a few times. Bought 2 small Pillow Vibrator little motors that ran on 12 volts and wired them into the turn signals, one motor for each side to keep it simple. Cut out a little foam and stuck them there. Been working for years.