In article .com,
Jonathan Morris says...

In the case of a keep left/keep right sign, it must be possible to have
a swappable sign that's fitted in a 'window' at the top and secured in
place somehow, to prevent kids playing around with it.

Like they already are?

Then you can have an arrow either way,

You didn't do well in mental agility tests did you? If you rotate the
keep left sign 270 degrees, it looks like a keep right one...


--
Conor

Windows & Outlook/OE in particular, shipped with settings making them
as open to entry as a starlet in a porno. Steve B