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Author Topic: MDOT discussing plans to flip I-75 and I-69 interchange  (Read 605 times)

afguy

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MDOT discussing plans to flip I-75 and I-69 interchange
« on: December 25, 2019, 09:22:05 PM »

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A new proposal calls for flipping the configuration so I-75 bridges travel over I-69. Currently, I-69 travels over I-75 at the interchange.

MDOT has been studying the interchange and the I-75 corridor from Court Street in Flint Township to the U.S. 23 split in Mundy Township for ways to improve traffic flow and safety.

RELATED: MDOT exploring options to upgrade I-75 and I-69 interchange

Officials will discuss and receive feedback on MDOT's preferred design option for changes to the I-75 and I-69 interchange and other interchanges along the stretch, including Miller Road, during a meeting in December.
https://www.abc12.com/content/news/MDOT-discussing-plans-to-flip-I-75-and-I-69-interchange-565434521.html
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DJStephens

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Re: MDOT discussing plans to flip I-75 and I-69 interchange
« Reply #1 on: December 26, 2019, 02:16:24 PM »

Don't know specifics of particular traffic patterns in this area, but perhaps bridge lifespans are nearing end due to de-icing chemicals may be a part of this discussion.   Bearing seats, rockers, and girders themselves.   Non epoxy coated reinforcement in pier caps, piers, and bridge decks also?   
Are some of the pavements seen in the video the original longitudinal concrete slabs?  Pretty amazing if so - that is fifty plus years in a very harsh climate.   
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The Ghostbuster

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Re: MDOT discussing plans to flip I-75 and I-69 interchange
« Reply #2 on: December 26, 2019, 04:22:40 PM »

I've never heard of a proposal like this before. Has this ever been tried anywhere else in the country that anyone knows about?
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GaryV

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Re: MDOT discussing plans to flip I-75 and I-69 interchange
« Reply #3 on: December 26, 2019, 04:50:33 PM »

Maybe they want to make I-75 4 thru lanes each way, which they can't do because of the RR overpass?
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tradephoric

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Re: MDOT discussing plans to flip I-75 and I-69 interchange
« Reply #4 on: December 26, 2019, 05:24:12 PM »

The EB I-69 to SB I-75 movement does have one of the worst merges of any major interchange in Michigan.  It just dumps you onto I-75 without an acceleration lane because it's got to funnel back down to 3 lanes before the RR overpass.  That would be nice not to deal with anymore.
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afguy

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Re: MDOT discussing plans to flip I-75 and I-69 interchange
« Reply #5 on: December 26, 2019, 07:28:03 PM »

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The process began in 2018 when officials researched different options for the interchange and now, a preferred alternative as emerged.

"Using collector distributor routes on both northbound and southbound I-75 to handle all the ramp traffic," said MDOT engineer Trevor Block.

He said officials took into account the public's concerns about the interchange, which included problems with congestion on the highways and merging to come up with the alternative.

The preferred alternative would allow for seamless traffic and two dedicated lanes to handle the ramp traffic on I-75 that would then merge back on to the road at a single point.

This work would happen along with a proposal to move I-75 traffic above I-69, instead of below like it is now.

"We are hoping we can take care of a lot problems that occur out there," Block said.


Limiting the amount of crashes that happen in the area is another reason for this alternative.

"Safety is definitely a big problem. It's part of what we are looking at," Block said. "A lot of the crashes that do occur through that area are a result of those short taper lanes, ability to get on or off the expressway."

Limiting crashes would allow officials to keep the lanes open near the interchange.

"We have a crash and then it's a safety concern and additionally it compounds to an operation problem where that causes a two lane closure to handle the crash," Block said. "And now we are left with one lane open and we get backups that are quite significant as well."

Any changes to the interchange will not take place for several more years. Block said that it would 2026 at the earliest before any construction begins.
abc12.com/content/news/Public-shares-feedback-on-states-proposed-change-to-I-69I-75-interchange-566105591.html
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Flint1979

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Re: MDOT discussing plans to flip I-75 and I-69 interchange
« Reply #6 on: December 26, 2019, 07:32:37 PM »

I saw this on the news about a week ago. It would be nice to see that done then I-75 can go over the railroad overpass instead of under it like it does now too.

I-75 should be eight lanes in this area as well.
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froggie

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Re: MDOT discussing plans to flip I-75 and I-69 interchange
« Reply #7 on: December 26, 2019, 11:26:16 PM »

I've never heard of a proposal like this before. Has this ever been tried anywhere else in the country that anyone knows about?

I-189/US 7 South Burlington, VT
I-394/MN 100 Golden Valley, MN

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wanderer2575

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Re: MDOT discussing plans to flip I-75 and I-69 interchange
« Reply #8 on: December 27, 2019, 12:39:34 AM »

I've never heard of a proposal like this before. Has this ever been tried anywhere else in the country that anyone knows about?

It's only a partial interchange, but Michigan just did it this year at I-96/I-196 in Grand Rapids while also adding a braided exit ramp to M-44/M-37.  The ramp from westbound I-96 to westbound I-196 used to go over eastbound I-96, and it now goes under.
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Revive 755

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Re: MDOT discussing plans to flip I-75 and I-69 interchange
« Reply #9 on: December 28, 2019, 06:19:46 PM »

I've never heard of a proposal like this before. Has this ever been tried anywhere else in the country that anyone knows about?

US 40/US 61 at I-270 in the St. Louis area.  US 40 used to go under I-270, but became the top level when the previous cloverleaf was rebuilt into a turbine-semi direct hybrid.
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sprjus4

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Re: MDOT discussing plans to flip I-75 and I-69 interchange
« Reply #10 on: December 28, 2019, 07:02:44 PM »

I've never heard of a proposal like this before. Has this ever been tried anywhere else in the country that anyone knows about?
I-95 / VA-630 Courthouse Rd in Stafford, VA.
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