3 ms·
Roundabouts aren't perfect but they greatly reduce the speed of traffic at the crossing point (while increasing the overall throughput of the intersection). Wi
by CuriousCosmic 2y ago
Roundabouts aren't perfect but they greatly reduce the speed of traffic at the crossing point (while increasing the overall throughput of the intersection).
Without looking up statistics (and I'd love to be proven wrong here), I'd be willing to guess that roundabouts may result in some marginal increase in minor accidents but massively reduces fatalities or accidents that leave the pedestrian in the ICU.
Additionally with a roundabout the crossing can be moved a few cars down the street away from the roundabout itself so that cars can have line of sight to safely approach the crossing and pedestrians have time to react to incoming vehicles. On top of that proper placement of crossings allows a normal zebra crossing to be upgraded to a pelican, puffin, or toucan crossing without impeding flow of traffic within the roundabout.
- inetknght 2y ago1-lane roundabouts are OK More than 1-lane and they're a disaster waiting to happen
- smileysteve 2y agoA disaster for cars, at a slower speed and similar direction than the comparable intersection (and no racing to/from from a light psychology). So a disaster with significantly better outcomes than a red light runner (with a high speed side swipe or head collision)
- cogman10 2y agoNah, 2 lanes are pretty manageable. Even for a pedestrian. You still only have traffic coming from one direction which makes it easy to see when you can cross. From a car perspective, it's just a matter of getting in the right lane for the exit you want.
- smileysteve 2y agoFor pedestrians, roundabouts also eliminate left turn lanes, saving ~9' of stroad width to cross and mean only looking one, predictable, direction at a time.
- cogman10 2y agoAt high traffic times, they can make a pedestrian wait longer. Not so fun when it's cold out. But otherwise somewhat easier to navigate.
- rcpt 2y agoWith roundabouts drivers only look to the left and don't come to a complete stop. If you're on foot trying to cross from the other direction good luck.
- CuriousCosmic 2y agoYep. Hence the appeal of turning the intersection into a roundabout and pulling the stoplights 3-5 cars from the roundabout and only stopping traffic when pedestrians are present (i.e. puffin and pelican crossing style). It gives cars enough time to turn and then halt with a bright red stop light to catch their attention.
- rcpt 2y agoRoundabout + pedestrian stoplight is probably fine. I don't think I've ever seen one and I live not too far from where the article is written. Seems like it's still worse for pedestrians as they have to wait for the beg button.
- CuriousCosmic 2y agoHere's a link to the Massachusetts Dept of Transportation's guide on designing/building roundabouts: https://www.mass.gov/doc/massdot-guidelines-for-the-planning-and-design-of-roundabouts https://www.mass.gov/doc/massdot-guidelines-for-the-planning... It provides solid guidance on how roundabouts should approach crossings to minimize risk of accidents or collisions without impeding traffic. Probably the best graphic is on page 45, figure 5-13
- andrepd 2y agoCrosswalks before the entry to the roundabout, where drivers need to stop anyway; bonus points for a gentle speed hump. Am I missing something?
- rcpt 2y agoWhat kind of roundabout has a "stop anyway"?
- throw7 2y agoI'm not against circles in general, but (along with pedestrians) they aren't exactly bike friendly either.