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[vdeane]

I-495 in NY has an alternate I-495 signed from the mainline.

[Great Lakes Roads]

Indiana uses white on blue "Emergency Detour" signs at certain places along I-65, I-69, and I-469. Fort Wayne and Lafayette are where I have seen them - not sure if there are other ones.

https://www.google.com/maps/@41.1307723,-85.1590783,3a,15y,344.1h,89.3t/data=!3m7!1e1!3m5!1swwTn1Mwhz82lKdtXVE8y7g!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3DwwTn1Mwhz82lKdtXVE8y7g%26cb_client%3Dmaps_sv.tactile.gps%26w%3D203%26h%3D100%26yaw%3D63.50002%26pitch%3D0%26thumbfov%3D100!7i13312!8i6656

They are also posted on certain places along I-94

[bing101]

Los Angeles has a short ALT I-5/I-10/CA 60:  https://goo.gl/maps/MbVe8Cp4WZpCePkR8

Mostly it's an alternate for drivers that don't have room to merge over for the left exit to I-10; it also tells drivers in the Mission Rd exit-only lane that they can re-enter either freeway (I-10 or US 101 to I-5/CA 60).  It's just taking the exit and continue straight across the intersection onto the on-ramp (which splits for the two freeways).

Also near downtown LA, I-710 North is marked as "ALT TRUCK ROUTE" since the ramp from I-710 to I-5 North is a left exit and entry (and that part of I-5 can get very congested approaching the East LA Interchange). A later sign clarifies that trucks headed for I-5 North should follow I-710 to I-10 West to I-5 North; trucks headed for US 101 North should take CA-60 West to US 101 North.

I seen Truck Route for I-5 in the Sylmar area at the Newhall interchange that gets used as an alternate route.
At the south end of the San Joaquin Valley there is also an alternate I-5 for Trucks specifically and that's at the south end of CA-99.

[fillup420]

There are Alternate I-40 banners along I-87, US-264 and I-95 to get around the long-term I-40 widened projects between the Raleigh Beltline and [now south of] McGees Crossroads.  When they were first installed, you could follow them all the way.  They've been up so long now that I doubt that you could find your way using signs alone.

Did I actually say I-87?   

You can also find an  "ALT ROUTE" I-40 sign at the end of the off-ramp from I-40 West to US-117 at the interchange between Warsaw and Magnolia (Exit 369). That one's been there long before the Raleigh projects started.

One can also find this head-scratcher on the US 70 Clayton bypass just east of the jct with I-40

[oscar]

I seen Truck Route for I-5 in the Sylmar area at the Newhall interchange that gets used as an alternate route.
At the south end of the San Joaquin Valley there is also an alternate I-5 for Trucks specifically and that's at the south end of CA-99.

The Newhall truck route is a separate freeway in both directions, with a different centerline from the I-5 mainline, and Caltrans treats it as a separate route (route 5S). It's an old routing that trucks are required to use, to bypass the I-5/I-210/CA 14 mess. Cars can use it too, and indeed use it to exit to the Sierra Highway (historic US 6), which has no exit from the mainline.

The truck lanes at the south end of CA 99 are southbound-only.

[Evan_Th]

There are Alternate I-40 banners along I-87, US-264 and I-95 to get around the long-term I-40 widened projects between the Raleigh Beltline and [now south of] McGees Crossroads.  When they were first installed, you could follow them all the way.  They've been up so long now that I doubt that you could find your way using signs alone.

Did I actually say I-87?   

You can also find an  "ALT ROUTE" I-40 sign at the end of the off-ramp from I-40 West to US-117 at the interchange between Warsaw and Magnolia (Exit 369). That one's been there long before the Raleigh projects started.

One can also find this head-scratcher on the US 70 Clayton bypass just east of the jct with I-40

I'm scratching my head trying to think how that could be ALT W 40.  Do they want you to go all the way east to 95 and then back west on 264?  Wouldn't it be faster to take 42 to 50 to west 70, or 42 to 55 to 540?

[Revive 755]

Illinois has a couple instances of Alt 39/90:
* Along Business 20 in the Belivdere area

* Along IL 76 towards Wisconsin

There also used to be Alt 39 signs along IL 251:  Former example near IL 64 (the banners orange but I seem to recall these staying up when there was no construction on I-39.

Iowa used to and probably still has some emergency detour signing for some of their interstates:  Former example for I-380, former example for I-80

[hbelkins]

Illinois has a couple instances of Alt 39/90:
* Along Business 20 in the Belivdere area

* Along IL 76 towards Wisconsin

There also used to be Alt 39 signs along IL 251:  Former example near IL 64 (the banners orange but I seem to recall these staying up when there was no construction on I-39.

But are they flat?

[Dirt Roads]

One can also find this head-scratcher on the US 70 Clayton bypass just east of the jct with I-40

I'm scratching my head trying to think how that could be ALT W 40.  Do they want you to go all the way east to 95 and then back west on 264?  Wouldn't it be faster to take 42 to 50 to west 70, or 42 to 55 to 540?

I think that NC-42 -to- NC-50 to US-70 West through Garner is already being used by locals as a construction bypass for I-40 and generally worse off.  I've had to use NC-42 -to- NC-55 -to- NC-540 several times (I usually stay on NC-55 all the way to I-40 to avoid the tolls).  I suspect that the main issue is for those folks who are actually going to Raleigh instead of RTP.  They would need to backtrack into Raleigh on I-40 and/or the Beltline.