My guess is that busses don't use sensors in the lane but rather a radio signal. Which makes sense because it's flexible with regards to speed and which direction the bus needs to go. And not all intersections have dedicated bus lanes.
🚨 are useful, but red lights add a lot of safety.
Not if their hacked. Expected safety can be more dangerous than no safeguards, because people pay more attention
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Offline but reachable by short range radio seems like a fine compromise to me. It requires physical proximity to mess with, which doesn't scale and is relatively easy for police to investigate. Just modernize the encryption.
Yes, that sounds acceptable
