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Atlanta intersections that should be upgraded to interchanges

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Georgia Guardrail:
What are some at-grade intersections in Atlanta in the vast metro area that you all think should be upgraded to grade separated interchanges (or at least semi-interchanges)?

For me I'd start with these:

1.) Windy Hill Rd SE and US 41 in Marietta (SPUI)
2.) SR 54 & SR 74 in Peachtree City (folded diamond or left-turn flyover)
3.) Johnson Ferry Road and Peachtree Dunwoody Road in Dunwoody (diamond)

There are a bunch of them. I cant even hame them all. Especially the outdated interchanges where main arteries meet with interstates in the metro area...I can name a few that need to be converted into DDI's or gutted and completely rebuilt

SR 20 @ IH 85
LaVista Rd @ IH 285
SR 120 (Old Milton Pkwy) @SR 400

There are many others especially in Gwinnett county as the sprawl there continues into Barrow and Walton Counties

SR 20 & I-85 already got an upgrade a couple decades ago when Mall of Georgia was being built. Interesting that the area grew so fast that the interchange is considered outdated now.

IMO SR 20 Should be a minimum of 6 lanes total and 8 lanes total in urban areas in its entire roundabout of the Atlanta suburbs. Especially since no outer perimeter will be built. SR 20 is the closet thing to can take over an hour to get from Buford to Cumming during peak hours on that route

SR 20 in Cumming has serious issues in that Forsyth county is one of the fastest growing in the country since 2010...

US 89:
I wish Georgia would experiment more with SPUIs when they want to upgrade diamonds instead of DDIs. As far as I know, they only have the one on 400 at Lenox. Also, the way they program their DDIs never seems to improve much. Jimmy Carter and I-85 needs something better than the DDI it has now.

SR 54/74 in Peachtree City desperately needs some sort of upgrade. The US 78/US 278/GA 6 intersection in Lithia Springs also comes to mind.


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