Unauthorized drone signs appear on highways

MARIN CITY, Calif. (KGO) -- Some drivers in Marin County may have spotted fake road signs this week, though the prank was so well done many probably didn't even notice.

Just below this speed limit sign is another that says "speed enforced by drones." Though the CHP doesn't use drones.

The signs were spotted on Highway 101 in Marin City and Highway 37 in Novato on Monday.

Caltrans crews had them removed that night.

The CHP has no idea who put them up.

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