Most drivers don’t give much thought to traffic lights other than noticing when the light changes from green to yellow to red and back again. But if you look closely, you’ll notice some pretty interesting and intentional design choices.
For instance, some feature a series of black lines running across the lens. Nope, those lines aren’t cracks, decorative covers, shadows, or burned-out lights. They’re actually louvers.
Learn what those black lines, actually louvers used on Dallas Display traffic signals, are designed to do, and what drivers should do when they encounter them.
What Do Dallas Display Lines on Traffic Lights Mean?
Those narrow slats sit over certain traffic signal lenses and work a little like window blinds. Depending on where a driver is positioned, the louvers can block the light from view…