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Old 06-21-2013, 11:15 AM
 
Location: From the Middle East of the USA
664 posts, read 583,221 times
Reputation: 598

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They are the best system of controlling and alleviating traffic in an urban area. Cities should have those types of intersections in their urban core near convention centers, ball stadiums, multi-purpose facilities.
I hate a bottleneck after a big event like a concert, and I think under and over passes make sense. Your thoughts!
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Old 06-21-2013, 11:32 AM
 
Location: Hoover, Alabama
153 posts, read 234,620 times
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Yes, it would help with traffic, but those types of intersections would be hard to but into dense urban areas and also significantly affect walkability.
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Old 06-21-2013, 11:49 AM
 
Location: The City
22,331 posts, read 32,176,306 times
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These are the things that many times destroyed DTs

Some cities have underpasses that get past major intersections but a little different than say a true highway overpass

DC has many for example already

Washington, DC - Google Maps

Washington, DC - Google Maps

Also at some point there is a bottleneck at peaks regardless cars would eventually have to enter someplace to park etc.
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Old 06-21-2013, 12:14 PM
 
Location: Philaburbia
32,390 posts, read 59,868,870 times
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They're expensive to build and maintain, take up a lot of space, and hinder traffic turning from one road to another.
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Old 06-21-2013, 06:56 PM
 
12,302 posts, read 15,205,734 times
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There are other places with under and overpasses. In Chicago there used to be one by a major amusement park. One in Lake County IL recently completed. But they mostly make sense where traffic is always heavy. Near a football stadium where it's only congested ten games a year? Hardly worth the effort. Sometimes there is incidental grade separation where a bridge over a river or railroad also goes over a road. Of course, civil engineers do reams of traffic studies before one is built.
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Old 07-08-2013, 10:19 PM
 
3,492 posts, read 4,959,765 times
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There are some cities that use them effectively, and the residents are very grateful for the light traffic. It works in practice every bit as well as it works in theory. I've been living in one of those paradises for the last year.
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Old 07-08-2013, 10:55 PM
 
3,836 posts, read 4,717,097 times
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The reason you don't do these things is because making a great city and moving the most amount of traffic as quickly as possible are not the same thing.
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Old 07-10-2013, 06:03 AM
 
Location: From the Middle East of the USA
664 posts, read 583,221 times
Reputation: 598
Quote:
Originally Posted by lurtsman View Post
There are some cities that use them effectively, and the residents are very grateful for the light traffic. It works in practice every bit as well as it works in theory. I've been living in one of those paradises for the last year.
I think most people would be grateful for light traffic.
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Old 07-10-2013, 08:44 AM
 
Location: Pittsburgh, PA (Morningside)
12,436 posts, read 11,937,287 times
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Quote:
Originally Posted by hickoryfan View Post
I think most people would be grateful for light traffic.
Only if they drive more than they walk through downtown.
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Old 07-12-2013, 12:16 PM
 
48,516 posts, read 83,966,925 times
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Quote:
Originally Posted by Komeht View Post
The reason you don't do these things is because making a great city and moving the most amount of traffic as quickly as possible are not the same thing.
A lot of things make little sense really. Such as having major interstates build going thru major urban high density areas with the materials they carry.
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