3 ms·

They’re extremely common in the U.S. now.

• apwell23 1y ago
  any data to share ? i've never seen one in chicago. google tells me its <1%. maybe i am not using right keywords.
  • evardlo 1y ago
    There are hundreds in Chicago: https://deflock.me https://deflock.me
    • kortilla 1y ago
      Those are not for traffic signal alteration
    • deleted 1y ago
      [deleted]
• mh- 1y ago
  Traffic cameras, yes. Traffic cameras that are used to influence traffic signaling? I've never (knowingly) seen one in the US. What US cities have these?
  • dgacmu 1y ago
    We have one here as part of a CMU research deployment: https://www.transportation.gov/utc/surtrac-people-upgrading-surtrac-pittsburgh-deployment-incorporate-pedestrian-friendly https://www.transportation.gov/utc/surtrac-people-upgrading-... > The system applies artificial intelligence to traffic signals equipped with cameras or radars adapting in realtime to dynamic traffic patterns of complex urban grids, experienced in neighborhoods like East Liberty in the City of Pittsburgh Now, that said, I have serious issues with that system: It seemed heavily biased to vehicle throughput over pedestrians, and it's not at all clear that it was making the right long-term choice as far as the incentives it created. But it _was_ cameras watching traffic to influence signaling. https://www.transportation.gov/utc/surtrac-people-upgrading-surtrac-pittsburgh-deployment-incorporate-pedestrian-friendly https://www.transportation.gov/utc/surtrac-people-upgrading-... https://en.wikipedia.org/wiki/Scalable_Urban_Traffic_Control https://en.wikipedia.org/wiki/Scalable_Urban_Traffic_Control
    • mh- 1y ago
      Interesting, thanks!
  • itsmartapuntocm 1y ago
    I see them everywhere in Metro Atlanta. You can tell because there’s what looks like a little camera above each direction facing traffic light.
    • mh- 1y ago
      If you're talking about the ones I think you are, those are preemption signal devices [0] for emergency vehicles. [0]: https://ops.fhwa.dot.gov/publications/fhwahop08024/chapter9.htm https://ops.fhwa.dot.gov/publications/fhwahop08024/chapter9....
      • itsmartapuntocm 1y ago
        No these aren’t optical sensors like those, they’re full blown cameras. Cobb County at least on their website says they use camera sensors as well as buried induction loops.