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KIFulgore | 3 years ago

I live near Carmel, Indiana, the roundabout capital of the US. Small ones, large ones, figure 8's, figure... double-peanut-looking things with elevated crossovers near interstate junctions. They work well and keep traffic moving.

But there is a learning curve. Every new roundabout causes a significant jump in crashes for a short time. Though, those crashes tend to be "glancing blows" that cause less serious injuries due to the angle of attack imposes by the roundabout.

Smaller cities and towns in Indiana are adopting more roundabouts near congested areas. It's important to introduce them gradually and give drivers time to acclimate.

https://www.nytimes.com/2021/11/20/climate/roundabouts-clima...

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mobilene|3 years ago

I'm near Carmel too. I remember when the roundabouts started going in. They replaced four-way stops that backed up for miles at rush hour. The roundabouts made traffic flow SO much better.

Now Carmel is replacing some stoplights with roundabouts. This man's opinion is that they are not always better. But so far, they've never been worse.

kevin_thibedeau|3 years ago

They absolutely suck when a train of cars forms and you can't enter the loop. Those are the dumbest roundabouts in the country. They don't adequately force cars to slow down enough to let gaps develop in the flow.

smeej|3 years ago

The other stupid thing about Carmel roundabouts is where they put them at every 3rd road crossing when it would have worked absolutely fine just to have the traffic going one way stop, because it's a neighborhood with thoroughfares and cross streets, and there is NEVER traffic on the cross streets.

It just makes the thoroughfares slower for no clear reason.

cogman10|3 years ago

A failing activity I've seen with roundabouts is when there is no physical barrier but instead just a bump in the road that everyone is supposed to go around. In those cases, a LOT of people end up treating the round about like a 4 way intersection with the worst of all world (because you don't know if someone is going to go against the roundabout rules to turn left).

There HAS to be a lump big enough to cause someone to go the right way around.

yamtaddle|3 years ago

Ours typically have a bit in the middle that's usually grass behind a curb, then a lower raised bit with a bevelled curb that's all concrete surrounding that, or else just an area around the center-grassy-bit that's even with the rest of the pavement but marked off with "don't drive here" stripes. The ordinary lanes are outside both.

I assume those are affordances so buses (say, school buses), trucks towing trailers, and stuff like that, can actually use the roundabouts. They'd be damn tricky for them to navigate, otherwise.

lcnPylGDnU4H9OF|3 years ago

Kinda off topic, but this reminds me of a racing game I played which had a track that featured a roundabout with a bump just perfect for Dukes of Hazarding it.

So ideally the roundabout also doesn't encourage sweet jumps. (Unless there's a very well-designed designated landing spot that prevents damage to the vehicle. Probably tax dollars can be spent on better things.)

fudged71|3 years ago

What if they put a flexible bollard in the center?

formerkrogemp|3 years ago

> I live near Carmel, Indiana, the roundabout capital of the US. Small ones, large ones, figure 8's, figure... double-peanut-looking things with elevated crossovers near interstate junctions. They work well and keep traffic moving. But there is a learning curve. Every new roundabout causes a significant jump in crashes for a short time. Though, those crashes tend to be "glancing blows" that cause less serious injuries due to the angle of attack imposes by the roundabout.

I have a reason to visit Indiana now! Cool. I wonder how I can sell the family on a trip to Carmel or similar city :).

The town I grew up started adopting roundabouts as I started driving. They're awesome and so much faster than red lights! They annoy my older relatives and coworkers as well.

smeej|3 years ago

Carmel is basically a suburb of Indianapolis, and all kinds of things happen at the Indianapolis Convention Center. Surely you can sell your family on one of them!