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MDOT discussing plans to flip I-75 and I-69 interchange

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GaryV:
I'm guessing that by far most of the traffic on I-75 and I-69 in Flint is not from Flint.

Flint1979:
This stretch of I-75 should be eight lanes anyway. It carries between 90,000-100,000 VPD while the stretch between Flint and Saginaw that is eight lanes doesn't carry as high of a volume. The highest on that stretch is between MM 125 and 126 at about 87,000 VPD.

I don't get why they didn't go south of the northern terminus of I-475 with the eight lanes as the traffic volumes stay steady in that area dropping down to 76,000 between 122 and 125 and then picking back up to around 90,000 south of there until the US-23 split which would include the area being discussed here. US-23 is actually busier than I-75 south of the split btw.

This would ease a lot of problems though. The on ramp going to SB I-75 from EB I-69 the ramp has to cut over to miss a train bridge that is in the way causing merging problems there. The ramp going from EB I-69 to NB I-75 isn't the worst but it's a 25 mph ramp that is a circle. I-69 has been worked on in the area the last few years and is in need of more repairs itself.

This is a very congested area. You have I-69 traffic coming onto I-75, you have US-23 traffic coming onto I-75, you have Bishop Airport traffic coming onto all three highways and vice versa. Plus you have a GM plant right there at the Bristol Road exit.

Ryctor2018:
Furthermore, (hopefully) one day US-23 will be widened to six lanes from Flint to Toledo. This I-69/I-75 project could help with that expansion.

wanderer2575:

--- Quote from: Flint1979 on May 14, 2021, 01:23:04 PM ---I don't get why they didn't go south of the northern terminus of I-475 with the eight lanes as the traffic volumes stay steady in that area dropping down to 76,000 between 122 and 125 and then picking back up to around 90,000 south of there until the US-23 split which would include the area being discussed here. US-23 is actually busier than I-75 south of the split btw.

--- End quote ---

Until they are able to widen all of I-75 between the northern I-475 terminus and the I-75/US-23 split, it's pointless to widen any part of it, at least southbound.  I don't expect it will all be done at once, but there isn't anything lined up right now for even the possibility of getting funding and ROW for all of it.  There is more of a case for having widened north of the northern I-475 terminus because the 3di can be used as an alternate for I-75 (not US-23) traffic.

sprjus4:

--- Quote from: wanderer2575 on May 14, 2021, 04:28:54 PM ---
--- Quote from: Flint1979 on May 14, 2021, 01:23:04 PM ---I don't get why they didn't go south of the northern terminus of I-475 with the eight lanes as the traffic volumes stay steady in that area dropping down to 76,000 between 122 and 125 and then picking back up to around 90,000 south of there until the US-23 split which would include the area being discussed here. US-23 is actually busier than I-75 south of the split btw.

--- End quote ---

Until they are able to widen all of I-75 between the northern I-475 terminus and the I-75/US-23 split, it's pointless to widen any part of it, at least southbound.  I don't expect it will all be done at once, but there isn't anything lined up right now for even the possibility of getting funding and ROW for all of it.  There is more of a case for having widened north of the northern I-475 terminus because the 3di can be used as an alternate for I-75 (not US-23) traffic.

--- End quote ---
But the segment north of I-475 is already 8 lanes and sufficiently carries its volumes. There’s no need for any further expansion.

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