Turn-signal monitor sounds a loud piezo buzzer if you leave your turn signal on.
ELECTRONICS EXPERIMENTERS HANDBOOK Summer 1995 pg. 93
Turn-signal reminder for your car. Sounds a musical chime when your turn signal has been on for too long.
ELECTRONICS HOBBYISTS HANDBOOK Spring 1994 pg. 23
Smart turn signal. Warning signal to turn off your turn signal starts at low volume and then increases to overcome road noise or other distractions.
ELECTRONICS NOW Sep 1993 (v.64#9) pg. 63
Preventive maintenance for turn signals.
HOME MECHANIX #698 Jun 1986 (v.82) pg. 26
Automotive projects. (1) Turn indicator annunciator for the hearing impaired. (2) Battery-charger probe checks to see if a charger is already on and/or connected properly. (3) Circuit to add both turn and brake signals to older vehicles. (4) Headlight reminder alarm that requires only 3 components. (5) Circuit to determine if your engine-block heater is working.
POPULAR ELECTRONICS [2] Mar 1992 (v.9#3) pg. 73
Correction POPULAR ELECTRONICS [2] Jun 1992 (v.9#6) pg. 70 (Headlight reminder alarm)
Build a turn-signal turn-off reminder.
POPULAR ELECTRONICS [2] Mar 1993 (v.10#3) pg. 61
Turn-signal monitor and delayed turn-signal monitor circuits remind you to turn off your turn signals.
POPULAR ELECTRONICS [2] Feb 1995 (v.12#2) pg. 70
Tip suggests why turn-signal blinkers slow down when headlights are on and how to correct the problem.
POPULAR MECHANICS Jan 1997 (v.174#1) pg. 104
Using diodes to connect turn lights to the brake light bulbs on older Packards.
SKINNED KNUCKLES #201 Apr 1993 (v.17#9) pg. 23