I had difficulty parsing that title. At first I read it as '"Fake Signs On Bay Area Highways" Say Drones Looking For Speeders' i.e. there are already drones e

I had difficulty parsing that title. At first I read it as '"Fake Signs On Bay Area Highways" Say Drones Looking For Speeders' i.e. there are already drones enforcing the speed limit, and they are reporting (or being confused by) fake signs (maybe installed by pranksters for that purpose.)