Rarest sign type in the USA

[hotdogPi]

What advantage would a red up arrow have over a standard red orb? I'm assuming that I'm just not clever enough to come up with one.

1. To make clear that it's not a right turn if it would be ambiguous, indicating that turn on red is not allowed.
2. Red up arrow, while the left and/or right arrows are something other than solid red.

[jakeroot]

What advantage would a red up arrow have over a standard red orb? I'm assuming that I'm just not clever enough to come up with one.

In states that utilize signal-per-lane strategies, hopefully it could lead to less lane use signs (i.e. R3-5 signs). I've always found that those cause a lot of clutter. Could still be used without dedicated turn lanes. Agencies would just have to be clever with how they designed the signal assemblies.

In states where turns on red arrows aren't permitted (not mine but I know it's a thing elsewhere), it would also further solidify when one must wait for the green light. Sometimes (such as on the last page), movements can appear to be right turns to drivers, when the local agencies consider them straight-ahead. Basically what 1 is saying.

Ultimately, it would not have the same advantages as turn signals with arrows, but if those are considered bright enough for drivers, I see no reason that all-arrow assemblies shouldn't be allowed for straight-ahead movements as well.

[ErmineNotyours]

There's a few in the MUTCD range of R2-1 through R2-4a (Metric) - the metric speed limit is circled - which I've never seen photos of, just diagrams.

I've also never seen the R9-13 "No Skaters" sign.

What the heck is R5-5 supposed to be for?
I've never seen R9-1.

If you mean "walk on left facing traffic," there's one on NY 9N in Lake George with STATE LAW on top: https://goo.gl/maps/Zm3281gDtQn

In the hills above Woodinville, Washington they have a yellow diamond warning sign for this, which seems like overkill.  (Though it is near an elementary school.)

Pedestrain warning sign, Woodenville, WA by Arthur Allen, on Flickr

[DaBigE]

What advantage would a red up arrow have over a standard red orb? I'm assuming that I'm just not clever enough to come up with one.

Less confusion of what lane the signal is for when a signal for a turn lane is nearby: https://goo.gl/maps/SzoADQcXznt. Although, in that example, I think someone ordered too many arrows and not enough orbs and didn't feel the need to correct it.

[jakeroot]

What advantage would a red up arrow have over a standard red orb? I'm assuming that I'm just not clever enough to come up with one.

Less confusion of what lane the signal is for when a signal for a turn lane is nearby: https://goo.gl/maps/SzoADQcXznt. Although, in that example, I think someone ordered too many arrows and not enough orbs and didn't feel the need to correct it.

Particularly with those older Wisconsin setups, which I've always really liked. I've proposed several signal designs that use Wisconsin style signals for the right side of the intersection, using all arrow displays:

[TEG24601]

Back on Rare Signs...


I'm going with anything Purple or Pink, % Grade signs, and Night Speed Limits.

[kphoger]

Night Speed Limits.

I wonder how prevalent these are in Montana.  There are potentially a lot of them out there.