In Texas ... and just about everywhere else I've ever driven ... , you see it all the time. Peeps trying to be cool and warn other folks about a speed trap to save them a ticket. READ MORE: Over 800 New Laws In TexasThe question of whether it is illegal to warn drivers of a speed trap in Texas is not a clear-cut matter. Texas law does not explicitly prohibit the act of flashing headlights to alert others to the presence of law enforcement. 10 Real Texas Laws You Won’t Believe Are On The Books These Texas laws seem pretty weird, but they must be there for a reason, right?