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One advantage of something machine-readable, like a QR code, would be to incorporate additional information (more than could be easily consumed by a human). Fo
by labcomputer 4y ago
One advantage of something machine-readable, like a QR code, would be to incorporate additional information (more than could be easily consumed by a human).
For example, a speed limit sign could include the name of the road it controls, which would help reduce instances of cars suddenly slowing to 35 mph on the freeway when passing a sign on the frontage road.
It might also be useful for cases of (this is US-centric) yellow "advisory" speeds posted for, e.g., sharp curves. The machine-readable aspect might indicate how long the advisory speed applies (next 1000 ft) and why (sharp curve, hidden intersection, etc.)
- xani_ 4y agoIf you just want to feed computers just put a database with every sign location and data. That way even faking or destroying sign would be ineffective. Would have to be updated during temporary situations (roadwork etc) tho
- mbreese 4y ago> That way even faking or destroying sign would be ineffective In theory you could add an HMAC (or similar) signature to the QR code. It would be bigger, but if cars maintained a DB of state DOT public keys, you could mitigate this somewhat. Then you’d also have to worry about duplicate codes, but at least they wouldn’t be “fake”. Maybe even add lat/long coordinates to the code… again, more data, more pixels required, but it would make sure the signs are roughly in the right place. Which doesn’t seem all that feasible to require construction crews to put the right sign in the right place. Logistically this doesn’t seem all that promising.
- labcomputer 4y agoJust give the road crew a phone app that can read the sign. Given the phone's camera, compass and GPS, validating that the sign has been installed as specified (location, facing direction) is almost trivial.