Oklahoma

[Great Lakes Roads]

Which interchange is it? The one on the East side of town or the West side?

The west side (the one with a convoluted route to get onto I-40 EB from Gary Boulevard).

[Bobby5280]

The EB I-40 off-ramp to Gary Blvd looks kind of like a movement in a turbine interchange. The off-ramp's bridge going over the I-40 main lanes looks old as hell. The design looks like it dates back to at least the 1960's, if not older. Unless the entire interchange is re-configured into another type of design it looks like that old bridge may be the only structure that gets replaced. The other ramps might get some new pavement.

I really don't like the WB I-40 arrangement in that location. The on-ramp from Neptune Drive onto WB I-40 is really close to the next exit ramp from WB I-40 to Gary Blvd. The end of either ramp is only 1000' apart. I'll bet serious traffic weaving issues occur there, even with Clinton being a small town. In a bigger city those ramps would have to be braided to eliminate the weaving conflicts.

[rte66man]

Here's the most recent link I could find (2019)
https://oklahoma.gov/odot/about-us/public-meetings/archive/2019/20190228.html

[Bobby5280]

That video from 2019 is pretty informative. The proposal would get rid of the turbine style loop ramp from EB I-40 to NB Gary Blvd. More importantly, exits 65 and 65A would effectively be combined into one single exit. That would eliminate the dangerous weaving issues present on WB I-40 between the exit 65A on ramp and exit 65 off ramp. I'm not a big fan of roundabouts. Motorists will have to do a good bit more back-tracking when going thru them. But that section of Interstate will be safer.

[Great Lakes Roads]

That video from 2019 is pretty informative. The proposal would get rid of the turbine style loop ramp from EB I-40 to NB Gary Blvd. More importantly, exits 65 and 65A would effectively be combined into one single exit. That would eliminate the dangerous weaving issues present on WB I-40 between the exit 65A on ramp and exit 65 off ramp. I'm not a big fan of roundabouts. Motorists will have to do a good bit more back-tracking when going thru them. But that section of Interstate will be safer.

That design from 2019 has since been replaced with a different design.

ODOT actually went with a diamond interchange for Gary Boulevard with a Texas turnaround. The Texas turnaround will be used for traffic heading to 10th Street/Neptune Drive from westbound I-40 as well as accessing eastbound I-40 from 10th Street/Neptune Drive. Yes, it will still be one interchange, but a different design than what ODOT preferred from the 2019 meeting.

2020 meeting: https://oklahoma.gov/odot/about-us/public-meetings/archive/2020/20201202.html

[rte66man]

That video from 2019 is pretty informative. The proposal would get rid of the turbine style loop ramp from EB I-40 to NB Gary Blvd. More importantly, exits 65 and 65A would effectively be combined into one single exit. That would eliminate the dangerous weaving issues present on WB I-40 between the exit 65A on ramp and exit 65 off ramp. I'm not a big fan of roundabouts. Motorists will have to do a good bit more back-tracking when going thru them. But that section of Interstate will be safer.

That design from 2019 has since been replaced with a different design.

ODOT actually went with a diamond interchange for Gary Boulevard with a Texas turnaround. The Texas turnaround will be used for traffic heading to 10th Street/Neptune Drive from westbound I-40 as well as accessing eastbound I-40 from 10th Street/Neptune Drive. Yes, it will still be one interchange, but a different design than what ODOT preferred from the 2019 meeting.

2020 meeting: https://oklahoma.gov/odot/about-us/public-meetings/archive/2020/20201202.html

Thanks for the update. I knew there were changes but I could not find them.

[Bobby5280]

The updated changes look like a much cheaper design. It still removes the weaving conflicts on WB I-40 currently present between exits 65A and 65. But the trade-off is traffic exiting WB I-40 to Gary Blvd will have to merge with vehicles coming from Neptune Drive to get on I-40.

The U-turn movement along Gary Blvd makes up for two I-40 ramps being removed at Neptune Drive. It isn't much of a bonus, considering the extra distances vehicles coming to/from Neptune Drive will have to cover. I think the short extension of Gary Blvd down to Chapman Road makes up for that a bit. I can't tell if the new I-40 exit with Gary Blvd will have traffic signals. The presence of signal lights could influence how locals access I-40, either using Chapman Road or Neptune Drive.