Is Flashing Your Headlights at Another Car Illegal in Alabama? Imagine you're heading to work at 4 a.m. It's dark and you're on a two-lane highway and then you notice another car approaching you. This car has its headlights on bright and it's absolutely blinding you. What do you do? Here's another scenario: you're headed down the highway and pass a cop hiding in what appears to be a speed trap. You want to warn other drivers about the potential of getting a massive speeding ticket, so what do you do? Get our free mobile app Do you flash your headlights at the other cars? And if you do, are you breaking the law? The answer may surprise you.