Well, the first sign you are referring to has since at least 2011 been replaced (though doubtless, Ireland being Ireland, not everywhere yet!) by sign RUS 004 "keep straight ahead" (white on blue), which is identical to UK diagram 606 (arrow pointing up) "proceed ahead only".c2R wrote: ↑Thu Sep 05, 2019 09:17It might be consistent, but I still don't like the red circle with the forward arrow being the sign for a one way street... it also makes it difficult to sign the end of a prohibition if the same sign is used with a line through it to indicate no entry...Viator wrote: ↑Wed Sep 04, 2019 05:05Only Ireland has consistent signage in that regard:jgharston wrote: ↑Tue Sep 03, 2019 21:08 Also, the standard sign is a stick figure in a red circle - people naturally expect a "NO" sign to have a line through it, and could understandably see a sign without a strikethrough as being *not* a "NO" sign. 'cos there's no strikethrough, innit.
I do think that all "NO" signs really should consistantly have a strikethrough.
a red-edged circle without a strikethrough imposes a LIMIT of some kind (e.g. maximum permitted speed)
while a similar sign WITH a strikethrough means "NO [...] allowed at all" (e.g. no overtaking)
As a further example of this, a black-on-white P in a red circle means limited parking, while the same sign with a red strikethrough means "no parking" (at any time).
I do have a beef, however, with the way RUS 004 is used: from what I've seen it typically gets placed after the junction instead of before it -- this is probably due in very large part to the fact that Ireland lacks an informational (rectangular) sign corresponding to the UK's diagram 652 "one way traffic".
With regard to the second sign you mention (RUS 011 "no straight ahead"), this has -- again since 2011 -- been replaced in almost all situations by RUS 050 "no entry" (white bar on red disc), which is identical in design to UK diagram 616. RUS 011 has been retained, however, for situations where the "no straight ahead" regulation is not absolute, i.e. where there are exceptions (certain times of day, classes of vehicle, etc.), these exceptions being specified on a supplementary plate.