Why YSK: Your signals alert other drivers as to what you’re doing; a signal bulb costs a few bucks and is usually a quick and easy repair to do yourself (consult YouTube); and any place that regulates motor vehicles probably requires you to have working turn signals. So knowing when and how to replace a burned out signal bulb can save you an interaction with law enforcement.
Adding: You can diagnose which bulb is out by turning on your hazard lights and checking all four corners of your car. It’ll be the one not flashing.
This is also probably a good time to check your brake lights. Put something heavy on the pedal or have a friend hold it down and check that all three brake lights illuminate. Replacing a burned out brake light is also usually pretty cheap, quick, and easy.
Everyone with a car should be checking their signals at least once a week.
Park near either a reflective surface or close enough to a wall that you can see the lights individually. Apply your brakes make sure all of them light up, turn your signals on and make sure front and back on both left and right side flash, with emergency brake applied go into neutral and take your foot off the brake to make sure your reverse lights work, test your high beams and fog lights.