29 ms·

>Even if they don't prevent all collisions, they turn T-bones into glancing hits No, they don't, at least not in America. When you let American traffic engine

>Even if they don't prevent all collisions, they turn T-bones into glancing hits No, they don't, at least not in America. When you let American traffic engineers design a roundabout, you get this: https://www.google.com/maps/@38.8643875,-77.2755474,583m/ https://www.google.com/maps/@38.8643875,-77.2755474,583m/

lozenge 2y ago
That's... Not a roundabout. It would be funny if it weren't so scary.
esskay 2y ago
Nobody in their right mind would ever class that as a roundabout. You dont stick a high speed road directly through a roundabout. An actual roundabout DOES solve the tbone issue.
offices 2y ago
This reminds me of this oddity in Nottingham: https://osm.org/go/eu8S4TeKc?way=50459468 https://osm.org/go/eu8S4TeKc?way=50459468 (right-hand drive)
ndsipa_pomu 2y ago
That looks like a Hamburger Junction (or roundabout interchange https://www.roads.org.uk/interchanges/roundabout-interchange https://www.roads.org.uk/interchanges/roundabout-interchange). I think they're a bad design as they encourage drivers to go fast with the sweeping corners etc. Ideally, a roundabout should be designed to slow traffic joining it to reduce collisions and their severity. Trying to keep vehicles moving quickly at junctions is just asking for trouble.
USiBqidmOOkAqRb 2y ago
It's disheartening to see that much parking place around that spot.
ColinWright 2y ago
As others have said ... that's not a roundabout. Here's one of my favourite hybrid "roundabout" junctions: https://www.openstreetmap.org/search?query=Boughton%20Heath%20Junction#map=19/53.187559/-2.854042 https://www.openstreetmap.org/search?query=Boughton%20Heath%...
- shiroiushi 2y ago
  >As others have said ... that's not a roundabout. American traffic engineers would apparently disagree with you.
123pie123 2y ago
similar one here, but with added lights https://www.openstreetmap.org/#map=18/53.479432/-2.281970 https://www.openstreetmap.org/#map=18/53.479432/-2.281970
- shiroiushi 2y ago
  The one I linked to in Fairfax County VA also has lights, though it might not be obvious from the aerial view. It's really a disaster of traffic engineering. It's probably the most complicated intersection I've ever driven through.

lozenge 2y ago

That's... Not a roundabout. It would be funny if it weren't so scary.

esskay 2y ago

Nobody in their right mind would ever class that as a roundabout. You dont stick a high speed road directly through a roundabout. An actual roundabout DOES solve the tbone issue.

offices 2y ago

This reminds me of this oddity in Nottingham: https://osm.org/go/eu8S4TeKc?way=50459468 https://osm.org/go/eu8S4TeKc?way=50459468 (right-hand drive)

ndsipa_pomu 2y ago

That looks like a Hamburger Junction (or roundabout interchange https://www.roads.org.uk/interchanges/roundabout-interchange https://www.roads.org.uk/interchanges/roundabout-interchange). I think they're a bad design as they encourage drivers to go fast with the sweeping corners etc. Ideally, a roundabout should be designed to slow traffic joining it to reduce collisions and their severity. Trying to keep vehicles moving quickly at junctions is just asking for trouble.

USiBqidmOOkAqRb 2y ago

It's disheartening to see that much parking place around that spot.

ColinWright 2y ago

As others have said ... that's not a roundabout. Here's one of my favourite hybrid "roundabout" junctions: https://www.openstreetmap.org/search?query=Boughton%20Heath%20Junction#map=19/53.187559/-2.854042 https://www.openstreetmap.org/search?query=Boughton%20Heath%...

shiroiushi 2y ago
>As others have said ... that's not a roundabout. American traffic engineers would apparently disagree with you.

123pie123 2y ago

similar one here, but with added lights https://www.openstreetmap.org/#map=18/53.479432/-2.281970 https://www.openstreetmap.org/#map=18/53.479432/-2.281970

shiroiushi 2y ago
The one I linked to in Fairfax County VA also has lights, though it might not be obvious from the aerial view. It's really a disaster of traffic engineering. It's probably the most complicated intersection I've ever driven through.