(https://www.aaroads.com/midwest/wisconsin012/wi-029_eb_at_duck_creek_pkwy.jpg)
On Wis 29 local in Howard, WI, a bridge pier was placed in the center of a roundabout for a system ramp between Wis 29 east and I-41 north. There is another instance of a bridge pier in the center of a roundabout in Lincoln, NE at Salt Creek Roadway and Stadium Dr near Memorial Stadium.
https://www.google.com/maps/@40.822479,-96.7072829,3a,75y,229.47h,85.82t/data=!3m7!1e1!3m5!1shxBwt6kMawjGqEU6-M-pBA!2e0!6s%2F%2Fgeo3.ggpht.com%2Fcbk%3Fpanoid%3DhxBwt6kMawjGqEU6-M-pBA%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D261.08533%26pitch%3D0!7i13312!8i6656?hl=en
Are there any other instances where bridge piers are placed in the center of roundabouts?
Washington Avenue Extension at CR 156 (Fuller Road), Albany (https://www.google.com/maps/@42.6927383,-73.8308575,3a,75y,28.57h,90.2t/data=!3m7!1e1!3m5!1spbqvf7Iax45PxlSYGbkJGQ!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3Dpbqvf7Iax45PxlSYGbkJGQ%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D45.081917%26pitch%3D0!7i13312!8i6656)
169th & Marth Road, Bloomington, MN:
https://www.google.com/maps/@44.8580727,-93.3931378,71m/data=!3m1!1e3
Isn't this pretty common for roundabout-under-highway interchanges ?
...like this one in Newton, KS (https://goo.gl/maps/asCMSXjxenL2)...
Quote from: kphoger on April 08, 2016, 12:17:26 PM
Isn't this pretty common for roundabout-under-highway interchanges ?
...like this one in Newton, KS (https://goo.gl/maps/asCMSXjxenL2)...
It is, but such interchanges are rare in this country.
In NJ: The Airport Circle (30/130/38) and Somerville Circle (202/206) are underneath highways with bridge piers in the middle.
The Airport Circle itself isn't much of a true circle anymore, but it still functions more/less like one, albeit with traffic lights.
Quote from: cl94 on April 08, 2016, 12:42:45 PM
Quote from: kphoger on April 08, 2016, 12:17:26 PM
Isn't this pretty common for roundabout-under-highway interchanges ?
...like this one in Newton, KS (https://goo.gl/maps/asCMSXjxenL2)...
It is, but such interchanges are rare in this country.
In the US, I think it's more common to have a dumbbell or dogbone interchange (diamond interchange with two roundabout intersections) than to have a single roundabout. This makes for a shorter bridge above and saves money in construction costs.
Golden Ears Way, a relatively new freeway in Maple Ridge, British Columbia, passes over a roundabout. The roundabout has a ramp towards the freeway, but it's only for buses:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FP5jYG0L.png&hash=8c7d7f53a51482d8d134483265ed6e8c507b17fc)
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FLmrUtu0.png&hash=49d610f45b5b3c5c0c547b182234631f6ce6fc40)
Quote from: jakeroot on April 09, 2016, 04:29:56 PM
Golden Ears Way, a relatively new freeway in Maple Ridge, British Columbia, passes over a roundabout. The roundabout has a ramp towards the freeway, but it's only for buses:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FP5jYG0L.png&hash=8c7d7f53a51482d8d134483265ed6e8c507b17fc)
What are the two-color signals for?
Quote from: cl94 on April 09, 2016, 04:31:12 PM
Quote from: jakeroot on April 09, 2016, 04:29:56 PM
Golden Ears Way, a relatively new freeway in Maple Ridge, British Columbia, passes over a roundabout. The roundabout has a ramp towards the freeway, but it's only for buses:
http://i.imgur.com/P5jYG0L.png
What are the two-color signals for?
It's a train signal. There's a train crossing to the left of the image; it prevents traffic from blocking the roundabout. That said, it was only activated last year, and I've yet to see it in action. I don't really see the point. A yellow box across the entry points would do this signal's job just as well.
I have found interchanges like this to be quite common in Massachusetts, but the circles tend to be very large. Example: https://www.google.com/maps/@42.2099835,-70.9953422,15.62z?hl=en
Quote from: paulthemapguy on April 21, 2016, 11:15:39 PM
I have found interchanges like this to be quite common in Massachusetts, but the circles tend to be very large. Example: https://www.google.com/maps/@42.2099835,-70.9953422,15.62z?hl=en
Ah, yes, the rotary interchange. Those things can be a flipping nightmare with the speeds people take them at.
There's myriad in the UK - especially at roundabout interchanges like the rotary versions in MA. Here's one of the most interesting:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fjoneville.com%2Fphotography%2Fwp-content%2Fuploads%2F2010%2F11%2FIMG_0025_1028.jpg&hash=39120f0f0e33fb2000de326f16e210cf5f866c89)
Though the brick viaduct here at Bushey Arches predates the invention of circular islands in the middle of junctions by about 80 years (1834-7 construction) and so the roundabout is a way of getting past the bridge piers (rather than funnel through one arch - which was the original situation) rather than the bridge piers using the roundabout to ground themselves on, but for the later parallel viaduct the use of the roundabout to plonk a support down is definitely the case.
Quote from: paulthemapguy on April 21, 2016, 11:15:39 PM
I have found interchanges like this to be quite common in Massachusetts, but the circles tend to be very large. Example: https://www.google.com/maps/@42.2099835,-70.9953422,15.62z?hl=en
Wow, that's not even "bridge pier in roundabout" level... that's "two separate bridges to cross circle" level!
From last year's Madison meet, pier inside and piers outside roundabout for same bridge support: https://goo.gl/maps/7haWbTJUT7G2
Quote from: vdeane on April 22, 2016, 12:43:01 PM
Quote from: paulthemapguy on April 21, 2016, 11:15:39 PM
I have found interchanges like this to be quite common in Massachusetts, but the circles tend to be very large. Example: https://www.google.com/maps/@42.2099835,-70.9953422,15.62z?hl=en
Wow, that's not even "bridge pier in roundabout" level... that's "two separate bridges to cross circle" level!
I prefer the circle on the northern end of US 202's crossing of the Connecticut (South Hadley side):
https://www.google.com/maps/@42.2372754,-72.6195376,11.92z
Never had any problems with it.
Concord Rotary's smaller and causes me to have white knuckles much more often...although I've never witnessed an accident there.