Signs specific to a state

[NE2]

South Carolina: keep moving change lanes later
Virginia: unmarked pavement ahead (in construction zones)

[hotdogPi]

MA: "Go Children Slow", "Autistic Caution Child", or anything with similar wording
MA: Thickly settled
MA: "Bookleaf" town line signs
NH: Seat belts required for commercial drivers and those under 18, recommended for all (I forget the exact wording)
TX: Speed limit 85

[jp the roadgeek]

MA: "Go Children Slow", "Autistic Caution Child", or anything with similar wording

Used to be ones in CT that said "Deaf Slow Children"

Also CT: Larger yellow  SPEED LIMIT AHEAD xx M.P.H. signs

VT: Frost heaves

[thenetwork]

NC:  Burn Headlights When Raining

[1995hoo]

North Carolina's use of "Reduce Speed Ahead" (instead of "Reduced Speed Ahead") almost qualifies. Almost. But you can find a few in Virginia on I-395 in the express lanes and on the Dulles Toll Road approaching the main toll plaza (but, oddly, notice the other sign to the right says "Reduced").

A sign that I believe is unique to Virginia is one you see very quickly after crossing into the state: RADAR DETECTORS ILLEGAL.

[Roadgeekteen]

Oregon- "Speed X"

[1995hoo]

Two sign styles I don't think I've ever seen outside Florida:

—Signs for electronic toll collection lanes with a banner saying "PREPAID TOLLS ONLY." (Those are disappearing with the end of cash tolls in Florida.)

—Signs for toll facilities listing payment methods and giving a bunch of ETC system logos.

[freebrickproductions]

This sign used under W1-6 and W1-7 signs is exclusive to Alabama, IIRC:
https://www.google.com/maps/@34.6102606,-85.6552932,3a,15y,233.67h,85.1t/data=!3m7!1e1!3m5!1sn5o7F_ZFEdG2Webi_BUUJQ!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fcb_client%3Dmaps_sv.tactile%26w%3D900%26h%3D600%26pitch%3D4.899114872929161%26panoid%3Dn5o7F_ZFEdG2Webi_BUUJQ%26yaw%3D233.66796540430494!7i16384!8i8192?entry=ttu&g_ep=EgoyMDI1MDkxNi4wIKXMDSoASAFQAw%3D%3D

[CoreySamson]

This sign used under W1-6 and W1-7 signs is exclusive to Alabama, IIRC:
https://www.google.com/maps/@34.6102606,-85.6552932,3a,15y,233.67h,85.1t/data=!3m7!1e1!3m5!1sn5o7F_ZFEdG2Webi_BUUJQ!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fcb_client%3Dmaps_sv.tactile%26w%3D900%26h%3D600%26pitch%3D4.899114872929161%26panoid%3Dn5o7F_ZFEdG2Webi_BUUJQ%26yaw%3D233.66796540430494!7i16384!8i8192?entry=ttu&g_ep=EgoyMDI1MDkxNi4wIKXMDSoASAFQAw%3D%3D

Along those lines, Texas also has their own version of the W1-7 called the W1-7(T):
https://maps.app.goo.gl/7BcLNDcvsSPg3SGGA

There's also this variant of the "LEFT LANE FOR PASSING ONLY" sign, which I don't think I've seen elsewhere:
https://maps.app.goo.gl/tp4ztM56q8HHbUds8

Oklahoma has "DO NOT DRIVE INTO SMOKE:"
https://maps.app.goo.gl/aCiqyoNebCiJxejP8

[Mapmikey]

—Signs for toll facilities listing payment methods and giving a bunch of ETC system logos.

Both NC 540 and US 74 Byp Monroe have them...

[kphoger]

Oklahoma

STATE LAW
MERGE NOW
→

[Scott5114]

Nevada has a whole host of animal-silhouette warning signs that don't appear in the federal manual. Notable ones are the burro warning sign (what other state needs that?) and the cattle warning sign (normally paired with an "Open Range" plaque).

California and Nevada have their own version of the bear crossing sign that has twice the number of bears as the federal bear crossing sign.

The left-turn-lane signs in Clark County are subtly different from the federal ones, to make it easier to indicate a U turn as a possibility.

Maryland has its "Lane Ends" warning sign with the downward diagonal arrows.

[elsmere241]

Maryland has its "Lane Ends" warning sign with the downward diagonal arrows.

Delaware now has them here and there.  One thing I noticed coming back here in 2002 is that Delaware doesn't seem to have any consistent signing practices.

It did have a few distinctive signs, that usually have taken a more conventional form.  Still lingering are signs that are yellow on blue, that normally would have been white on green.

[1995hoo]

—Signs for toll facilities listing payment methods and giving a bunch of ETC system logos.

Both NC 540 and US 74 Byp Monroe have them...

Interesting. Thanks. I haven't been on either of those.

[vdeane]

There's these classics from NY.

[wanderer2575]

Michigan's "fare" instead of "toll" at toll bridges (although this is currently changing as signs are replaced):

[freebrickproductions]

There's these classics from NY.

I'm pretty sure I've seen signs with that exact wording here in the south, didn't it predate the "Reduced Speed Ahead" wording?

[Big John]

There's these classics from NY.

I'm pretty sure I've seen signs with that exact wording here in the south, didn't it predate the "Reduced Speed Ahead" wording?

Illinois used that wording too.

[Big John]

Michigan's "fare" instead of "toll" at toll bridges (although this is currently changing as signs are replaced):

and the reduced speed zone ahead sign without saying the speed limit will be.

[vdeane]

There's these classics from NY.

I'm pretty sure I've seen signs with that exact wording here in the south, didn't it predate the "Reduced Speed Ahead" wording?

Illinois used that wording too.

That's interesting, because IIRC the NY signs were linked to a specific legal concept of linear vs. area speed limits that either isn't around much or is around much less in the rest of the country (basically, the NY speed limit signs that say "city speed limit X", "area speed limit X", etc. are more than just informational).

The fact that I didn't think of the speed limit signs themselves in the first place probably says something about how well my brain has been functioning this month... I really need to get more sleep at some point.

[ElishaGOtis]

A few more from Florida:

- "Crocodile Crossing" (there's a total of around 4 of these I've seen) https://maps.app.goo.gl/AcDh9G9AhyfWmVZ68

- "Thru Lanes" (like express lanes on a toll road, but no extra toll is paid and a transponder is required) https://maps.app.goo.gl/H6ugLbYGdE5vJ8Ex9

- Weigh station electronic override signage ("Permitted loads enter facility regardless of signal") https://maps.app.goo.gl/bSDxX1ZcZDsdG9QT9

Some other states I've included are...
Arizona: "Speed Reduced Ahead" https://maps.app.goo.gl/An4WjPBb66ZZumfp7

Oklahoma: "Do not impede left lane" (being phased out) https://maps.app.goo.gl/gEk61WT1nZLDHKHx8

Oklahoma

STATE LAW
MERGE NOW
→

Then they wonder why zipper merging is unpopular... (what's even funnier is that Oklahoma uses zipper merging signs despite the sorta-ban on it)...

This sign used under W1-6 and W1-7 signs is exclusive to Alabama, IIRC:
https://www.google.com/maps/@34.6102606,-85.6552932,3a,15y,233.67h,85.1t/data=!3m7!1e1!3m5!1sn5o7F_ZFEdG2Webi_BUUJQ!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fcb_client%3Dmaps_sv.tactile%26w%3D900%26h%3D600%26pitch%3D4.899114872929161%26panoid%3Dn5o7F_ZFEdG2Webi_BUUJQ%26yaw%3D233.66796540430494!7i16384!8i8192?entry=ttu&g_ep=EgoyMDI1MDkxNi4wIKXMDSoASAFQAw%3D%3D

Along those lines, Texas also has their own version of the W1-7 called the W1-7(T):
https://maps.app.goo.gl/7BcLNDcvsSPg3SGGA

There's also this variant of the "LEFT LANE FOR PASSING ONLY" sign, which I don't think I've seen elsewhere:
https://maps.app.goo.gl/tp4ztM56q8HHbUds8

Arkansas now also uses this left lane sign. https://maps.app.goo.gl/5VNSGeMcJzFY5K5b8

There's these classics from NY.

I'm pretty sure I've seen signs with that exact wording here in the south, didn't it predate the "Reduced Speed Ahead" wording?

Illinois used that wording too.

That's interesting, because IIRC the NY signs were linked to a specific legal concept of linear vs. area speed limits that either isn't around much or is around much less in the rest of the country (basically, the NY speed limit signs that say "city speed limit X", "area speed limit X", etc. are more than just informational).

The fact that I didn't think of the speed limit signs themselves in the first place probably says something about how well my brain has been functioning this month... I really need to get more sleep at some point.

These used to be standard signs in the MUTCD. Both were meant to indicate that a special speed restriction applied ahead that differed (usually lower) from the default speed limit.

[Dirt Roads]

West Virginia chimes in with:

Fractionals:






Delta Roads:




and the Orphans (HARP Roads), which are still posted but now defunct:




Shoutout to Andrew Turnbull's website with apologies for posting all of these from his website.  In the past, I've taken the time to find generic sources.

[Revive 755]

Maryland has its "Lane Ends" warning sign with the downward diagonal arrows.

Delaware now has them here and there.

Indiana has something similar:  Example on I-65.

Indiana also has "Work Site" instead of the "Work Zone" plaque used with speed limit signs in construction areas.

[Dough4872]

Pennsylvania has the color coded detour signs for freeways, such as "blue detour" or "red detour".

[Henry]

Another IL exclusive is the variant of the sign disallowing bicycles, mopeds and pedestrians on freeways that reads USE PROHIBITED BY NON-HIGHWAY VEHICLES.