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Old 01-14-2019, 07:21 PM
 
11,664 posts, read 7,796,814 times
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A bit concerned about these stacks of bridges and overpasses. They look like they've seen better days. The ramp that takes you from I-285 East to I-85 North has a huge chunk that fell onto the embankment where the wall used to be and has been replaced by a temporary barrier. Everytime I see those bridges fully loaded with cars stuck in traffic sitting atop them I can't help but wonder how much longer those bridges are going to last. I believe they are at, or very close to their lifespans ontop of which handling over double the traffic they were originally intended to handle.

I am wondering, if / when it comes time to replace them, what they will replace them with and how they will do it given the limited space.
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Old 01-14-2019, 07:25 PM
 
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what they will replace them with:
Diverging Diamonds?

and how they will do it given the limited space:
underground?
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Old 01-14-2019, 07:28 PM
 
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Don't you know that if we let them collapse and then replace them with 2 bike lanes, we won't induce demand anymore and everybody will be better off?
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Old 01-14-2019, 07:31 PM
 
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Quote:
Originally Posted by ATLTJL View Post
Don't you know that if we let them collapse and then replace them with 2 bike lanes, we won't induce demand anymore and everybody will be better off?
Tell that to the 7 million people who moved to a city with only one Stack Interchange.
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Old 01-14-2019, 07:37 PM
 
Location: Georgia native in McKinney, TX
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When was that interchange built? 90s? Certainly it has a longer lifespan than 20 years or so. There are much, much older bridges on interchanges all over the city. Thinking 285 and 20 both east and west are older than this.
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Old 01-14-2019, 07:55 PM
 
Location: Atlanta
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Quote:
Originally Posted by Saintmarks View Post
When was that interchange built? 90s? Certainly it has a longer lifespan than 20 years or so. There are much, much older bridges on interchanges all over the city. Thinking 285 and 20 both east and west are older than this.

It was the late 80's, and yeah. This is nothing compared to what I see in New England every summer, almost everything is covered in rust.
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Old 01-14-2019, 08:21 PM
 
Location: NW Atlanta
6,495 posts, read 6,067,862 times
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Quote:
Originally Posted by saintmarks View Post
when was that interchange built? 90s? Certainly it has a longer lifespan than 20 years or so. There are much, much older bridges on interchanges all over the city. Thinking 285 and 20 both east and west are older than this.

1984-87.
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Old 01-14-2019, 08:32 PM
 
11,664 posts, read 7,796,814 times
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Quote:
Originally Posted by Saintmarks View Post
When was that interchange built? 90s? Certainly it has a longer lifespan than 20 years or so. There are much, much older bridges on interchanges all over the city. Thinking 285 and 20 both east and west are older than this.
I believe Spaghetti Junctions life expectancy is 30 years.

Starting from the mid 80's to early 90's when it was built, it is approaching its maximum life expectancy and possibly breaching it given its handling much more traffic than it was intended to.

Although there are much older bridges in the city, you have to consider Spaghetti Junction handles alot more stress than either interchange of I-20/I-285 east or west which are not stacks built several feet into the air but are mostly ground embankments and standard overpasses.

Last edited by Need4Camaro; 01-14-2019 at 08:52 PM..
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Old 01-14-2019, 10:10 PM
 
4,757 posts, read 3,328,541 times
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Quote:
Originally Posted by atltjl View Post
don't you know that if we let them collapse and then replace them with 2 bike lanes, we won't induce demand anymore and everybody will be better off?

lmao.
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Old 01-14-2019, 10:13 PM
 
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I'm concerned about it all because the way the US politicizes infrastructure is scary. Our bridges, dams, pipes underground, etc., all need to be addressed.
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