Only in this state....

[SSOWorld]

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.

some remain in Minnesota.

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.

Wisconsin started installing them on centerlines - then putting up warning signs saying they're there.

IL: Warning signs saying "High Shoulder" on freeways (I-155 and I-72 are the only two I saw so far)  WTF is a high shoulder???

[Revive 755]

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

Been done in Missouri at least once on US 61 between Hannibal and I-70.

Only in Missouri though will you see a road with 10' lanes and both rumble centerline and rumble edgeline.

[Takumi]

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.

VA 13 and US 522 in Powhatan County also have them. I'm about to head to Suffolk, so I'll verify where the 460 rumble strips begin and end.

Only in Virginia (particularly Virginia Beach) are routes that haven't existed since the 1960s still posted with modern signage.

[txstateends]

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

Interesting to see the GROOVED SHOULDERS warning underneath the motorcycle diamond.  In TX, you're not warned about grooves in advance, they're just there.

[swbrotha100]

In Arizona, one highway can inherit its mileposts equal to the mileposts of another highway it branches from. For example, if AZ 79 branches off AZ 77 at milepost 95, the next milepost on AZ 79 will be milepost 96. Many of the older state and US highways do this. This also explains the mileposts and exit numbering for I-17.

[jp the roadgeek]

Only in the Buffalo area have I heard an interstate referred to with the word "The" before the highway.  Exit 52 off THE (pronounced thee) I-90 (what other I-90 is there?)

[dgolub]

Only in Connecticut:  BGS's with reflective button copy and route markers on the signs with green backgrounds.

Only in Mass.: Signs that say "Thickly Settled" when reaching a town

Only in Vermont: Yellow signs that warn of frost heaves.

Only in New York: The little green reference markers every 1/5 of a mile

Only in Delaware: Blinking green signals.

The little green reference markers appear every 1/10 of a miles, not 1/5.  There are also virtually identical markers used in Vermont.  As far as flashing green signals, I've seen them in Massachusetts as well.

[dgolub]

Only in Massachusetts: Signs indicating that a lane ends by saying "Lane Drop."

Only in New Jersey: County routes numbered on a statewide basis (CR 501, etc.)

Also only in New Jersey: Two different two-digit interstates with the same number, I-95 in the Trenton area and I-95 for the New Jersey Turnpike.  This one will eventually be fixed once they build the I-95/I-276 interchange in Pennsylvania.

[The High Plains Traveler]

Texas: "HIGHWAY INTERSECTION AHEAD" on a yellow warning sign in addition to any route markings near a junction.
California: Yellow school zone crossings. 

[vdeane]

Only in the Buffalo area have I heard an interstate referred to with the word "The" before the highway.  Exit 52 off THE (pronounced thee) I-90 (what other I-90 is there?)

Must be a merger between "The Thruway" and "Route 90".  Also, there is a NY 90 two hours to the east.

Also only in New Jersey: Two different two-digit interstates with the same number, I-95 in the Trenton area and I-95 for the New Jersey Turnpike.  This one will eventually be fixed once they build the I-95/I-276 interchange in Pennsylvania.

You also have the western/eastern Turnpike spur in northern NJ both being I-95.  I don't think there are any plans to fix that one.

[roadfro]

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.

Nevada has had this practice for years on all freeways (except for Summerlin Pkwy in Las Vegas). It's a freeway entrance sign, with route shield(s), directional banner(s) and downward angled arrow--usually at least one on each side of the ramp entrance.

[NE2]

Only in New Jersey: County routes numbered on a statewide basis (CR 501, etc.)

And Iowa, and Florida, and California.

[Alps]

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

Been done in Missouri at least once on US 61 between Hannibal and I-70.

Only in Missouri though will you see a road with 10' lanes and both rumble centerline and rumble edgeline.

Clearly you haven't been to Pennsylvania.

Only in the Buffalo area have I heard an interstate referred to with the word "The" before the highway.  Exit 52 off THE (pronounced thee) I-90 (what other I-90 is there?)

You've never heard "The 405?" California.

[roadman65]

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

Been done in Missouri at least once on US 61 between Hannibal and I-70.

Only in Missouri though will you see a road with 10' lanes and both rumble centerline and rumble edgeline.

Clearly you haven't been to Pennsylvania.

Only in the Buffalo area have I heard an interstate referred to with the word "The" before the highway.  Exit 52 off THE (pronounced thee) I-90 (what other I-90 is there?)

You've never heard "The 405?" California.

How about The 408 in Orlando?

[PurdueBill]

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

Been done in Missouri at least once on US 61 between Hannibal and I-70.

Only in Missouri though will you see a road with 10' lanes and both rumble centerline and rumble edgeline.

Clearly you haven't been to Pennsylvania.

Only in the Buffalo area have I heard an interstate referred to with the word "The" before the highway.  Exit 52 off THE (pronounced thee) I-90 (what other I-90 is there?)

You've never heard "The 405?" California.

How about The 408 in Orlando?

If he means people referring to "The I-90" in Buffalo, though, that's definitely different.  LA usage is "the X" where X is the number--be it state, US, or I-.  The 5, the 101, the 60, etc. etc...  They never say "the eye four-oh-five" with the I- in it.  (Do they?  Been to southern California many times, heard lots of KNX traffic reports, never heard the "I-" included there or by locals in conversation.

[thenetwork]

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 recalled seeing them in (Mesquite) Nevada as well.

[EchoCharlieHotel]

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.

Nevada has had this practice for years on all freeways (except for Summerlin Pkwy in Las Vegas). It's a freeway entrance sign, with route shield(s), directional banner(s) and downward angled arrow--usually at least one on each side of the ramp entrance.

One of the disadvantages of threads like this: if you're not widely traveled, these things are more common than you think.

Something else I've only ever noticed in Texas, but could be more common than that: Interstate business loops with letter suffixes. I noticed a lot of them on I-20 west of DFW on my trip there and back in 2009. I think I recall them incrementing west to east.

[roadman65]

True, I used to think New Jersey was the only state to have a second left turn signal head on the far left corner, until I visited Illinois.   Then I noticed that California, also has two left turn signal heads with one on the far left as well.

[swbrotha100]

True, I used to think New Jersey was the only state to have a second left turn signal head on the far left corner, until I visited Illinois.   Then I noticed that California, also has two left turn signal heads with one on the far left as well.

Arizona and Nevada have this too.

[kphoger]

Only in New Jersey: County routes numbered on a statewide basis (CR 501, etc.)

And Iowa, and Florida, and California.

I'm familiar with Iowa's grid system for numbering county highways.  Are there numbering systems for the other states mentioned?

[NE2]

Only in New Jersey: County routes numbered on a statewide basis (CR 501, etc.)

And Iowa, and Florida, and California.

I'm familiar with Iowa's grid system for numbering county highways.  Are there numbering systems for the other states mentioned?

California has a rough alphanumeric system too. Florida's county roads are mostly former state roads that retained their numbers.

[jp the roadgeek]

Only in New Jersey: County routes numbered on a statewide basis (CR 501, etc.)

And Iowa, and Florida, and California.

I'm familiar with Iowa's grid system for numbering county highways.  Are there numbering systems for the other states mentioned?

Connecticut has a unique secret state route system that actually works in some instances by county. 

400's: Special service roads statewide (ie. Bradley Airport connector extension, Hammonasset connector)
500's: Minor state roads in Hartford & Tolland counties
600's: Minor state roads in Windham, Middlesex and New London counties
700's: Minor state roads in New Haven county
800's: Minor state roads in Farifield and Litchfield counties
900's: Very short connector roads less than 1 mile (statewide)

[Alps]

Something else I've only ever noticed in Texas, but could be more common than that: Interstate business loops with letter suffixes. I noticed a lot of them on I-20 west of DFW on my trip there and back in 2009. I think I recall them incrementing west to east.

I think those are unique to Texas. Connecticut has a practice of numbering old alignments. For example, along US 1, you'll have Old Post Road #1, #2, #3, etc. Not sure how often they reset - either at county boundaries (which are otherwise useless) or within each town or city.

[Mapmikey]

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

There are still a number of signed T routes.  They just put the T in front of the number (in rectangles and circle shields) instead of above it like they used to.  The photo I posted is from Eastville on the Eastern Shore - there are two of those shields there and are the only two I have run into since I moved back to Virginia in 1995.

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

While this IS the norm, some JCT signage does exist at a few primary intersections that are not freeways/interstates.  This is on VA 45:


Oddly, what is more common are JCT signs with SR markers along primary routes, mostly in District 4 (Richmond region).


Mapmikey

[myosh_tino]

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?

Add Oregon to the list of states that have these types of assemblies at freeway on-ramps...


Image from the "California-style freeway entrance signage makes its way to Oregon" thread on the Northwest board.