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[CoolAngrybirdsrio4]

I-24 upgrades from Nashville to the Kentucky state line is up there for some of the most wanted projects:
https://clarksvillenow.com/local/interstate-24-widening-from-kentucky-state-line-to-nashville-tops-wish-list-from-local-leaders/

This is after they started expanding I-65 to 3 lanes up to the KY state line (TN 109 exit actually) from Nashville, to link the already 6 lane portion in Kentucky.

[ilpt4u]

I don’t head down to Nashville all that often from Southern IL, but when I do, I-24 is a slog in TN approaching Nashville from the northwest. I don’t know what the traffic counts are, but by gut feeling, 6 laning is justified

KTC will have to get on board not too long after, and push 6-laning up to at least Hopkinsville/the Pennyrile Pkwy/I-169?

[SkyPesos]

Should’ve upgraded Nashville-Chattanooga before Nashville-KY. Pretty sure the only long-distance traffic on I-24 northwest of Nashville are St Louis bound (and points beyond StL) traffic. Everyone else turns from I-24 WB to I-65 NB at Nashville.

[ilpt4u]

Should’ve upgraded Nashville-Chattanooga before Nashville-KY. Pretty sure the only long-distance traffic on I-24 northwest of Nashville are St Louis bound (and points beyond StL) traffic. Everyone else turns from I-24 WB to I-65 NB at Nashville.

Some Chicagoland and Wisconsin traffic (passenger and commercial) prefers the I-24/I-57 routing over the I-65 routing. It is a little longer, but it avoids Louisville and Indianapolis.

Another option that uses I-24 NW out of Nashville is the US 41 routing up to Chicagoland, also, which breaks off at the Pennyrile Pkwy. Shorter, but US 41 isn’t a full freeway in Henderson and Indiana

[Flint1979]

Should’ve upgraded Nashville-Chattanooga before Nashville-KY. Pretty sure the only long-distance traffic on I-24 northwest of Nashville are St Louis bound (and points beyond StL) traffic. Everyone else turns from I-24 WB to I-65 NB at Nashville.

Some Chicagoland and Wisconsin traffic (passenger and commercial) prefers the I-24/I-57 routing over the I-65 routing. It is a little longer, but it avoids Louisville and Indianapolis.

Another option that uses I-24 NW out of Nashville is the US 41 routing up to Chicagoland, also, which breaks off at the Pennyrile Pkwy. Shorter, but US 41 isn’t a full freeway in Henderson and Indiana

Well it says it takes the same amount of time to take I-24 to US-41 to IN-63 back to US-41 than it does to take I-57 to I-24 coming from Chicago to Nashville. Both are about 22 minutes longer than taking I-65. But taking I-24 to US-41 to IN-63 and back to US-41 cuts off about 70 miles vs. taking I-57 to I-24 for the same amount of time.

[froggie]

Not convinced that Nashville-Chattanooga needs upgrading.  There are significant traffic dropoffs on 24 at both Murphreesboro and I-59.

[SkyPesos]

Looking at AADT maps, I-24 between Murfreesboro and I-59 average between 30k-40k AADT, and between I-65 and the KY border is 50k-60k. To me, it's a bit surprising that the latter have higher traffic, maybe it's because of a high number of commuter trips between Nashville and Clarksville?

For comparison, I-71 between Columbus and Cleveland is 6 laned, with an AADT between 40k-50k in rural areas.

[I-39]

Definitely will need to be six lanes at some point, but I-65 between Goodlettsville and the state line is more urgently needed. I’d also say the small stretch of I-65 between I-840 and SR 396 is needed before I-24.

[wriddle082]

Not to nitpick too much, but I think this thread belongs in the Southeast region.  The Mid-South region covers West Tennessee only, which roughly translates to west of the Tennessee River or Area Codes 731 and 901.  But trust me, I do like this discussion, because I grew up 3.5 miles from I-24 in the Cane Ridge area of Davidson County, TN.

[edwaleni]

Not convinced that Nashville-Chattanooga needs upgrading.  There are significant traffic dropoffs on 24 at both Murphreesboro and I-59.

I can see some upgrades in the safety and geometry spaces in a couple of areas, specifically around Monteagle back to Chattanooga.

It has been awhile since I traversed this route, but I never saw any traffic issues beyond Chattanooga and not until Murfreesboro in the run to Nashville.

[wriddle082]

Not convinced that Nashville-Chattanooga needs upgrading.  There are significant traffic dropoffs on 24 at both Murphreesboro and I-59.

I can see some upgrades in the safety and geometry spaces in a couple of areas, specifically around Monteagle back to Chattanooga.

It has been awhile since I traversed this route, but I never saw any traffic issues beyond Chattanooga and not until Murfreesboro in the run to Nashville.

East of Monteagle, between Jasper and the GA line, I have experienced issues that have caused me to detour over to US 41/64/72 and/or TN 134/GA 299.  The worst stretch with geometric deficiencies that you speak of, outside the Monteagle grade, is from TN 156 to the GA line, and I think wrecks happen frequently as a result.

And of course it’s absolutely ridiculous that TDOT has yet to even start on widening I-24 from the other GA state line crossing to US 27 in Chattanooga.  I’m sure that once TN gets started, GA would follow suit very shortly thereafter and widen the rest of it to I-59.  This should have been done at least 20 years ago!

[Brian556]

Concerning the winding section from Nickajack Lake to east of I-59, I've always thought it was rediculous that there were not any winding road warning signs. Failure to post warning signs for hazards such as sharp curves or uphill grades with slow moving trucks is a problem on interstate highways in multiple states. Its like the DOTs have a false ides in their heads that interstate highways are hazard-free by design

[froggie]

And of course it’s absolutely ridiculous that TDOT has yet to even start on widening I-24 from the other GA state line crossing to US 27 in Chattanooga.  I’m sure that once TN gets started, GA would follow suit very shortly thereafter and widen the rest of it to I-59.  This should have been done at least 20 years ago!

Needed 2 decades ago, yes.  But two things to keep in mind here.  First, Tennessee does not bond or borrow money for road work...it is strictly a pay-as-you-go state.  So where would they have reallocated from to pay for I-24 widening?  Skip Nashville widening?  Skip building 840?  Skip repaving?  There's only so much to go around, and I-24 was not a high enough priority to be allocated, especially given the expense it would take to widen 24 there.

Which leads me to my second point:  I-24 at the base of Lookout Mountain is literally squeezed in between the railroad and the river bank...there isn't much room for anything else.  Sure, you have the median there, but it's not wide enough.  To do an inside widening and be within Interstate standards would require a previously-existing median of at least 46 feet.  Most of the median between Browns Ferry Rd and 27 is less than 40ft wide, dropping to as low as 26ft where 24 crosses Lookout Creek.  This would require at least some outside widening, which because of the tight spacing and existing traffic would be very expensive to undertake.

[sprjus4]

And of course it’s absolutely ridiculous that TDOT has yet to even start on widening I-24 from the other GA state line crossing to US 27 in Chattanooga.  I’m sure that once TN gets started, GA would follow suit very shortly thereafter and widen the rest of it to I-59.  This should have been done at least 20 years ago!

Needed 2 decades ago, yes.  But two things to keep in mind here.  First, Tennessee does not bond or borrow money for road work...it is strictly a pay-as-you-go state.  So where would they have reallocated from to pay for I-24 widening?  Skip Nashville widening?  Skip building 840?  Skip repaving?  There's only so much to go around, and I-24 was not a high enough priority to be allocated, especially given the expense it would take to widen 24 there.

Which leads me to my second point:  I-24 at the base of Lookout Mountain is literally squeezed in between the railroad and the river bank...there isn't much room for anything else.  Sure, you have the median there, but it's not wide enough.  To do an inside widening and be within Interstate standards would require a previously-existing median of at least 46 feet.  Most of the median between Browns Ferry Rd and 27 is less than 40ft wide, dropping to as low as 26ft where 24 crosses Lookout Creek.  This would require at least some outside widening, which because of the tight spacing and existing traffic would be very expensive to undertake.

A reduced cross section with a 4 ft left shoulder and median barrier could be acceptable, especially in this type of environment.

South Carolina, as an example, uses this method currently on modern interstate widening projects, even where there’s adequate room for a full left shoulder.

It would still require around 34 ft of median space though, assuming a 12 ft lane in each direction, 4 ft of shoulder, and 2 ft for a median barrier.