What states mark the names of roads on freeway overpasses, and which ones don't?

[KCRoadFan]

I was just thinking about how, when it comes to freeway overpasses, some states tend to mark them with a small green sign bearing the name of the road that crosses the bridge (visible to drivers on the freeway), whereas others prefer to leave theirs unmarked.

As for states I've spent a lot of time in, Missouri, Kansas, Minnesota, Indiana, and Pennsylvania seem to mark most of their overpasses, while in Iowa, Ohio, and Illinois, they largely go unsigned. What are the conventions in other states?

[thspfc]

Wisconsin does. Milwaukee specifically is very consistent about it.

[Revive 755]

As for states I've spent a lot of time in, Missouri, Kansas, Minnesota, Indiana, and Pennsylvania seem to mark most of their overpasses, while in Iowa, Ohio, and Illinois, they largely go unsigned. What are the conventions in other states?

The Illinois Tollway seems to usually mark the overpasses, and it doesn't seem too hard to find markings for overpasses in the Chicago IDOT District.

[webny99]

New York is pretty consistent with a small sign on the bridge itself, example here, but I prefer the more visible PA-style standalone signs, like this one.
Notably, however, New York doesn't typically sign underpasses, only overpasses.

[STLmapboy]

I was just thinking about how, when it comes to freeway overpasses, some states tend to mark them with a small green sign bearing the name of the road that crosses the bridge (visible to drivers on the freeway), whereas others prefer to leave theirs unmarked.

As for states I've spent a lot of time in, Missouri, Kansas, Minnesota, Indiana, and Pennsylvania seem to mark most of their overpasses, while in Iowa, Ohio, and Illinois, they largely go unsigned. What are the conventions in other states?

Missouri is half-and-half. Here are some typical MO bridge examples I just found.

Clearance posting is also sporadic (more so than naming overpasses). The sign typically goes on the bridge itself, not on a ground post, though exceptions exist. And then, of course, there are the big artsy bridges that loudly declare the road name.

And MO doesn't sign underpasses to my knowledge, like NY.

[Max Rockatansky]

Arizona does.  It was hard to miss Sore Finger Road on I-10 west of Phoenix. 

[Great Lakes Roads]

I know that West Virginia does...

EDIT: Never mind, West Virginia does not, but I know that Kentucky does do it...

[US 89]

The majority of Georgia's overpasses are labeled. Whether the whole sign is still there is another story...many of the signs on the Connector are half gone.

Utah sometimes marks theirs but is by no means regular about it. Most of the marked overpasses seem to be in the Davis County area.

[mapman]

I wish California did.  I think it help in navigating while driving.

[jakeroot]

Once common in WA, but the practice seems to have died off. Looking at projects along I-405 and WA-16, they're very hard to come by. Older underpasses and overpasses seem to have the majority of examples.

In BC, the practice is hit and miss. The reconstruction of Hwy 1 included a bunch of new examples (dozens, in fact), but there are plenty of overpasses and underpasses without anything. I would say more overpasses and underpasses have them than not, but it's not a firm practice.

[Flint1979]

I know that Michigan does.

[tylert120]

New York is pretty consistent with a small sign on the bridge itself, example here, but I prefer the more visible PA-style standalone signs, like this one.
Notably, however, New York doesn't typically sign underpasses, only overpasses.

I think in PA it depends what district you are in. In the Pittsburgh area, most are marked on the bridge itself. Up around Erie, like the example you posted, it seems most are ground mounted.

[GaryV]

I know that Michigan does.

Most times.  Sometimes the road name is omitted if there is another sign on the bridge, e.g. upcoming exit(s).  Perhaps to avoid info overload?

[jeffandnicole]

New Jersey generally does.

[cpzilliacus]

Maryland generally does.

[Rothman]

Perhaps it would be easier to identify the states that don't.

[hotdogPi]

Massachusetts does so on overpasses but not underpasses. For some reason, the Mass Pike always posts the street name, even if it has a route number. Elsewhere, the route number takes priority.

[frankenroad]

Ohio used to  - but they seem to have mostly discontinued that practice in the last 15-20 years.

[JoePCool14]

As for states I've spent a lot of time in, Missouri, Kansas, Minnesota, Indiana, and Pennsylvania seem to mark most of their overpasses, while in Iowa, Ohio, and Illinois, they largely go unsigned. What are the conventions in other states?

The Illinois Tollway seems to usually mark the overpasses, and it doesn't seem too hard to find markings for overpasses in the Chicago IDOT District.

IDOT definitely marks them in the Chicago area. As for the rest of the state, it is hit-or-miss from what I've seen.

[Flint1979]

I know that Michigan does.

Most times.  Sometimes the road name is omitted if there is another sign on the bridge, e.g. upcoming exit(s).  Perhaps to avoid info overload?

Yeah like the opposite of this one.

https://www.google.com/maps/@43.4150293,-83.8910555,3a,75y,210.73h,91.91t/data=!3m6!1e1!3m4!1sOpIXkaYoqmzhQU0XvDaDYg!2e0!7i16384!8i8192

That bridge though is going to be demolished real soon and is no longer used, a replacement bridge has been built next to it.

[jemacedo9]

New York is pretty consistent with a small sign on the bridge itself, example here, but I prefer the more visible PA-style standalone signs, like this one.
Notably, however, New York doesn't typically sign underpasses, only overpasses.

I think in PA it depends what district you are in. In the Pittsburgh area, most are marked on the bridge itself. Up around Erie, like the example you posted, it seems most are ground mounted.

PA varies by district.  SE PA (District 6-0) for the longest time didn't have any signage.  Then there was a project about 15 years ago to sign all overpasses AND underpasses with ground-mounted signs.  Most of the rest of PA seems to have overpasses only bridge-mounted except maybe the Erie area (District 1-0).

The PA Turnpike also for the longest time didn't have any signage...but about 20 years ago maybe, added bridge-mounted signage.

NY - the Thruway is bridge mounted, and the same with the Rochester area freeways.  But I-390 and I-86 (at least between I-390 and I-99) are ground mounted overpasses and underpasses.

[roadman65]

South Carolina uses a letter S followed by two sets of numbers. I believed these are the unnamed roads that have numbers while numbered routes like US 15 would have it marked as such.

[https://live.staticflickr.com/65535/50399008396_b5d772a664_4k_d.jpg[/i]

[roadman]

Massachusetts does so on overpasses but not underpasses. For some reason, the Mass Pike always posts the street name, even if it has a route number. Elsewhere, the route number takes priority.

The newer overpass street name signs on the Mass Pike (installed during the recent West Stockbridge to Auburn and Auburn to Boston sign projects) do not include the street name if the overcrossing road is a numered route.

[froggie]

Vermont doesn't.

New Hampshire does some, but I'm not sure if they do all.

Alabama didn't until about 15 years ago, then they instituted a program to add such signs to Interstate overpasses, even those that had interchanges.

[TheHighwayMan3561]

Minnesota did stop marking overpasses within an interchange (some marked interchange overpasses remain, mostly on I-394 with a couple holdovers other places)