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How do traffic signals work? (2019)

115 points · 86 comments · at1as

  1. skc · · focus · HN ↗
    Here's a surprising anecdote I've discovered living in South Africa wrt traffic lights.

    When they're not working at a busy intersection in my area, the intersection effectively becomes a four way stop. And I've found that as long as everybody follows the rules, traffic actually seems to flow FASTER than when the traffic lights are actually operable.

    I've timed this a few times.

    1. ViktorRay · · focus · HN ↗
      I think this would depend on the intersection.

      If the lights are at an intersection where a very busy road crosses with a less busy road then turning it into a four way stop just turns it into a traffic jam on the very busy road. I’ve seen this happen during rush hour in the United States multiple times.

      When it’s not rush hour though maybe the situation is different? Not sure.

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