Question about the construction at I-44 and US-169 (Tulsa)

Started by BigOkie, December 30, 2022, 12:42:06 PM

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Scott5114

Quote from: Bobby5280 on June 29, 2024, 12:57:03 AMA new cloverleaf interchange is going to be built on I-44 in Chickasha for the new US-81 bypass. I think construction on that starts in the next year or two.

It is kind of insane that Oklahoma is still building cloverleaf interchanges in the 21st century.
uncontrollable freak sardine salad chef


BigOkie

Since it's finished now I thought I'd throw up an updated overhead view (even though this one was before completion it was pretty close; the image is dated Oct 2023).



sprjus4

Quote from: Scott5114 on June 29, 2024, 04:51:24 AM
Quote from: Bobby5280 on June 29, 2024, 12:57:03 AMA new cloverleaf interchange is going to be built on I-44 in Chickasha for the new US-81 bypass. I think construction on that starts in the next year or two.

It is kind of insane that Oklahoma is still building cloverleaf interchanges in the 21st century.
A cloverleaf interchange in a low volume, rural area with C/D ramps is acceptable, IMO. North Carolina has built a few in the past decade or two, including near urban areas.

The important piece is the C/D ramps though... without those you're introduce even the smallest amount of conflict when a vehicle entering at 25 mph encounters 75 mph traffic.

Bobby5280

I haven't seen a detailed schematic of the US-81 bypass in Chickasha. But I'm pretty sure its interchange with I-44 is not going to include C/D ramps. The interchange should include C/D ramps for the sake of safety. I just don't think ODOT and OTA are going to spend the extra money for such a thing. After all, the US-81 bypass itself is going to be a (mostly) limited access Super-2 in its initial configuration and then expand to a 4-lane divided freeway in the future.

I don't like cloverleaf interchanges, but in semi-rural locations what other kinds of interchanges between two limited access highways could be built? A 4-level directional stack in Chickasha would be quite an extravagance. A pinwheel interchange could be a less expensive option than a stack, but it would still cost quite a lot more to build than a cloverleaf due to all the additional bridges and graded berms needed for the four interior spiral ramps.

sprjus4

Quote from: Bobby5280 on June 29, 2024, 04:23:50 PMI haven't seen a detailed schematic of the US-81 bypass in Chickasha. But I'm pretty sure its interchange with I-44 is not going to include C/D ramps. The interchange should include C/D ramps for the sake of safety. I just don't think ODOT and OTA are going to spend the extra money for such a thing. After all, the US-81 bypass itself is going to be a (mostly) limited access Super-2 in its initial configuration and then expand to a 4-lane divided freeway in the future.

I don't like cloverleaf interchanges, but in semi-rural locations what other kinds of interchanges between two limited access highways could be built? A 4-level directional stack in Chickasha would be quite an extravagance. A pinwheel interchange could be a less expensive option than a stack, but it would still cost quite a lot more to build than a cloverleaf due to all the additional bridges and graded berms needed for the four interior spiral ramps.
I did some digging and I found a project page from 2022, and then there was an Access Justification Report on there with signing plans on PDF 34-35. It appears there will be a single exit for both directions, then two individual exits for both I-44 and US-81, which would imply C/D lanes. Other traffic memos also show a split roadway there for both highways.

Project Page: https://oklahoma.gov/odot/progress-and-performance/federal-grant-awards/mpdg-grants/mpdg-2022/grady_county_us-81_realignment.html

Access Justification Report: https://oklahoma.gov/content/dam/ok/en/odot/federal-grants/mpdg/2022/grady-county-us-81-realignment/reports-and-technical-information/Access%20Justification%20Report.pdf

rte66man

Quote from: sprjus4 on June 29, 2024, 05:36:44 PM
Quote from: Bobby5280 on June 29, 2024, 04:23:50 PMI haven't seen a detailed schematic of the US-81 bypass in Chickasha. But I'm pretty sure its interchange with I-44 is not going to include C/D ramps. The interchange should include C/D ramps for the sake of safety. I just don't think ODOT and OTA are going to spend the extra money for such a thing. After all, the US-81 bypass itself is going to be a (mostly) limited access Super-2 in its initial configuration and then expand to a 4-lane divided freeway in the future.

I don't like cloverleaf interchanges, but in semi-rural locations what other kinds of interchanges between two limited access highways could be built? A 4-level directional stack in Chickasha would be quite an extravagance. A pinwheel interchange could be a less expensive option than a stack, but it would still cost quite a lot more to build than a cloverleaf due to all the additional bridges and graded berms needed for the four interior spiral ramps.
I did some digging and I found a project page from 2022, and then there was an Access Justification Report on there with signing plans on PDF 34-35. It appears there will be a single exit for both directions, then two individual exits for both I-44 and US-81, which would imply C/D lanes. Other traffic memos also show a split roadway there for both highways.

Project Page: https://oklahoma.gov/odot/progress-and-performance/federal-grant-awards/mpdg-grants/mpdg-2022/grady_county_us-81_realignment.html

Access Justification Report: https://oklahoma.gov/content/dam/ok/en/odot/federal-grants/mpdg/2022/grady-county-us-81-realignment/reports-and-technical-information/Access%20Justification%20Report.pdf

Full c/d lanes for both. Access Justification Report p31:
QuoteThe proposed access is part of the 8.24-mile US-81 project west of Chickasha. It is a cloverleaf full
interchange with collector-distributor roads that accommodate all basic movements needed for the
proposed interchange.
When you come to a fork in the road... TAKE IT.

                                                               -Yogi Berra

Bobby5280

That's a pleasant surprise. The C/D lanes would barrier-separate the slower, weaving traffic using the cloverleaf ramps from the I-44 thru traffic that is going upwards of 80mph or even faster on the main lanes. I wonder if C/D lanes will be built only alongside I-44 or built along both I-44 and the US-81 bypass. I'm guessing probably not for the latter.

It's too bad the cloverleaf interchange at I-44 and the H.E. Bailey Turnpike Extension wasn't built with C/D lanes. It doesn't look like those kinds of lanes could be added into the existing interchange either.

sprjus4

Quote from: Bobby5280 on July 02, 2024, 10:22:57 AMThat's a pleasant surprise. The C/D lanes would barrier-separate the slower, weaving traffic using the cloverleaf ramps from the I-44 thru traffic that is going upwards of 80mph or even faster on the main lanes. I wonder if C/D lanes will be built only alongside I-44 or built along both I-44 and the US-81 bypass. I'm guessing probably not for the latter.
The signage / schematic plans shows both highways will have C/D roadways.

bugo

Cloverleafs are not acceptable in 2024, period.
Nobody is on the level of the devil.

Plutonic Panda


DJStephens

C and D roadways make them acceptable in rural locations, where there is land availab le for an expansive interchange.   Believe they were constructed at several locations on the I-269 southern leg of the Memphis loop.   



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