The UK has been doing speeding tickets for years without even needing mobile drones. Just 2 video feeds from fixed cameras, some distance apart. OCR identifies the licence plate. When a vehicle is matched on both, distance and time gives you the average speed between them.
They have the same system on Italian autostradas. I look at installing this very simple, fool-proof system as a sign that a police force is actually allowed to seriously, non-pretend-like enforce the speed limits and improve road safety.
So, we have these in Baltimore, where I live. And, for the most part, Baltimoreans would not agree that the "police force is actually allowed to seriously, non-pretend-like enforce the speed limits and improve road safety".
The reason for this is that a large fraction of Baltimore drivers are not driving legally-registered vehicles with authentic tags, and another subset of the fraction that is installs devices to obfuscate their plates from the speed cameras.
This enforcement strategy does have the upside of being somewhat progressive, in that I assume speeding fines are disproportionately collected from the well-off residents most likely to opt into the (regressive) legal requirements of registration, insurance, etc, and thereby subsidize through their premiums the city's many uninsured low-income drivers.
The downside, of course, is that the illegal vehicles are already "in for a pound" and so generally attempt to drive like bats out of hell at all times it is plausibly physically possible (BPD is prohibited from pursuing for sensible safety reasons, but there's no effective system for later impounding the vehicle).
Data from our city department of transportation suggest that speed cameras on the highway have been effective at reducing crashes - apparently there a critical mass of law-abiding drivers slows everyone to reasonable speeds. On surface streets, they, and red-light cameras, seem less effective, with traffic calming really the only successful intervention.
https://www.webuyanycar.com/guides/car-ownership/average-spe...