Only in this state....

[CentralCAroadgeek]

Only in Texas:
- Interstates are called "IH-xx" instead of the regular "I-xx"
- Frontage roads in the goonies
- FM and RM roads

[Ian]

Pennsylvania is the only state I have seen to use a weaving area sign.  It is a warning sign (diamond), used largely in advance of auxiliary lanes with cloverleafs, with a symbol of two crossing arrows for a weaving movement.  I will see if I can get a picture, unless other Pa. participants here already have one.

Here you go!

Here are a few of mine...

-Only in Pennsylvania will you have a flat, straight section of 2-lane road with lots of visibility and still have a double yellow line.

-Only in Quebec will you see a sign like this.

-Only in New York will you see suffixed route with odd letters, such as NY 9P or NY 17K.

-Only in New York will you see different varieties of speed limits written on signs, such as state, and village.

-Only in New Hampshire will you see the suffix on a suffixed route get written below the number on a route shield, like so.

-Only in Vermont and New Hampshire will you see a sign with a skidding motorcycle.

[1995hoo]

This probably isn't really a fair one to post, but what the heck.

Only in Virginia, and only in Charlottesville, will you find the University of Virginia V-Sabres logo used on a BGS as though it were a shield: http://www.gribblenation.com/vapics/us29/us29bus_uva_us250-cvl.jpg

[theline]

Arkansas: rumble strips inside the stripe. They drive me crazy.

[mapman1071]

Does any state besides New Mexico have the "Dust Storms May Exist" signs?  [I think Texas and maybe other states have "Watch for Dust Storms" signs.]   

We were pretty tired by the time we drove thru and the wording just seemed very...existential...to us. We were somewhere between philosophical and punchy....

Arizona has these. also at one time Arizona had Flipable BG Pullthrus/ Yellow Blowing Dust Warning with flashing lights posted on I-8 (Casa Grande to Glia Bend) and I-10 (Queen Creek Road to Casa Grande).

[1995hoo]

Only in North Carolina do the white signs advising of an impending drop in the speed limit use the grammatically-correct "REDUCE SPEED AHEAD" rather than the form "REDUCED SPEED AHEAD" (which I maintain is grammatically incorrect because it is the speed limit that is reduced, and we've all seen speed-limit decreases that nobody obeys).

[Ian]

Arkansas: rumble strips inside the stripe. They drive me crazy.

And in Pennsylvania, rumble strips along the double yellow line on every state highway! 

Only in Wisconsin - one piece sine salads

This and others on http://www.alpsroads.net/roads/ri/us_6/

New Hampshire has them as well, though these may just be LGS's...

[1995hoo]

Arkansas: rumble strips inside the stripe. They drive me crazy.

And in Pennsylvania, rumble strips along the double yellow line on every state highway! 

....

I've seen that in Maryland as well (US-15 near Point of Rocks readily comes to mind), and I think I've seen it in Virginia but I'm not positive about that. In either case it's far less common than it is in Pennsylvania, though.

[kphoger]

"Do Not Drive Into Smoke" signs on the Will Rogers Turnpike here in Oklahoma.

The Kansas Turnpike has those as well.

Help!  How can I not find a picture of those signs online right now???

[Alps]

Not sure if it's elsewhere, but when I think of Massachusetts, I immediately think of text signs with arrows through the numbers

http://www.flickr.com/photos/33445721@N04/6454615515/

I think it was Colorado that used to do that also, but I'm far too lazy and have not enough time to verify.

[The High Plains Traveler]

Only in North Carolina do the white signs advising of an impending drop in the speed limit use the grammatically-correct "REDUCE SPEED AHEAD" rather than the form "REDUCED SPEED AHEAD" (which I maintain is grammatically incorrect because it is the speed limit that is reduced, and we've all seen speed-limit decreases that nobody obeys).

And in Arizona, it's inside a yellow warning sign and reads "SPEED REDUCED AHEAD".

[Revive 755]

Are there any other states other than Wisconsin that exclusively use letters to designate county highways?

Missouri

Those are state roads, not county.

[Dr Frankenstein]

Only in ON: using a different font size for every control city on a sign

More specifically: Road names larger than destinations on BGSes.

[Scott5114]

-Only in New York will you see suffixed route with odd letters, such as NY 9P or NY 17K.

OK 412P and OK 77S beg to differ!

[Mapmikey]

-Only in New Hampshire will you see the suffix on a suffixed route get written below the number on a route shield, like so.

Virginia does this with Y routes and used to do them with secondary T routes...







Also, Virginia does do the rumble strips in the center line...US 15 north of Leesburg and US 1 in a couple locations north of Richmond.  I want to say US 460 between Petersburg and Suffolk has some as well.

Mapmikey

[hbelkins]

Only in California: Arrows that point down and to the left (right) to the start of the entrance ramp on FREEWAY ENTRANCE sign assemblies. At least, CA's the only place I've seen those. Any other places have them?

West Virginia.

[74/171FAN]

Also, Virginia does do the rumble strips in the center line...US 15 north of Leesburg and US 1 in a couple locations north of Richmond.  I want to say US 460 between Petersburg and Suffolk has some as well.

Mapmikey

US 460 definitely has rumble strips in Sussex County between Waverly and Wakefield.  I'll be more certain when I drive to Wakefield next week.

[Kacie Jane]

Only in California: Arrows that point down and to the left (right) to the start of the entrance ramp on FREEWAY ENTRANCE sign assemblies. At least, CA's the only place I've seen those. Any other places have them?

West Virginia.

Washington does an all-out California-style assembly (with route shield and down arrows) extremely rarely, but they do exist; typically it's just the green FREEWAY ENTRANCE sign.

However, at least two on-ramps here in Bellingham have new signage, where the simple Freeway Entrance sign has been replaced by a much larger green sign retaining the legend and adding a downward pointing arrow (still no shields though).

[agentsteel53]

-Only in New Hampshire will you see the suffix on a suffixed route get written below the number on a route shield, like so.

the very first suffixed interstate shields were like this, but I don't think there are any examples left.  same with Maine or Massachusetts routes with A suffix, which used to be below the number.

[agentsteel53]

I think it was Colorado that used to do that also, but I'm far too lazy and have not enough time to verify.

[agentsteel53]

Only in California: Arrows that point down and to the left (right) to the start of the entrance ramp on FREEWAY ENTRANCE sign assemblies. At least, CA's the only place I've seen those. Any other places have them?

West Virginia.

I believe there are a few in Yuma, AZ as well - but they clearly were done by a CA contractor.

[DandyDan]

Nebraska is the only state with highway intersection diagram signs when two state highways meet.

[Alps]

Only in California: Arrows that point down and to the left (right) to the start of the entrance ramp on FREEWAY ENTRANCE sign assemblies. At least, CA's the only place I've seen those. Any other places have them?

West Virginia.

I believe there are a few in Yuma, AZ as well - but they clearly were done by a CA contractor.

I thought I saw these in the Phoenix area too. Anyway, they're in the MUTCD now.

Virginia does this with Y routes and used to do them with secondary T routes...



Mapmikey

I have never seen one of these T routes in my life. What and where are they?

[NE2]

T-xxx is a state-maintained route inside town limits. These still exist, but now they drop the T.

[amroad17]

Only in NC:  Black on white mileage pointers at intersections (currently being phased out, it appears).

Only in KY:  BGS supports that have the interior support bars going in all different directions.
                  -AA Hwy has rumble strips in the middle of the road also (in response to the many comments above)

Only in VA:  No junction signs at state/US hwy intersections (they do have many at state/US hwy intersections with I-hwys).