But not all experiments turn into successes. Arizona 's Department of Transportation predecessor, the Highway Department, eventually stuck to green. Nowadays, brown traffic signs are still in use.

Green road signs are most common on highways and provide directional guidance. They usually contain information about mileage, upcoming exits, and what lane to use if you’re taking an upcoming ...

Cruising down the 5 Freeway, behind a tractor-trailer with bold signs on the back of it. I am wondering if the signs are legal. One said, “Stay 200′ behind this trailer.” ...

After an experiment with a new font on interstate road signs, the Federal Highway Administration says its going back to its old look.