Those flashing police lights on I-10 or I-49 may not be a speed trap—they’re part of a traffic safety tactic designed to prevent wrecks. Here’s how it works (and why it matters).
For as long as many of us can remember, it's been red, yellow, green. Granted, in some places, you see a separate part of the light that shows protected greens or yellow or whatever. But generally, the 3-color combo is what we've known.