Unneeded discussion .???
That’s one of the purposes of this forum 
I wouldn’t put much emphasis on the where. In some places somewhere like the bus stop might be the best place - accessible, central and possibly owned by local authority.
Does size matter 
And what value would there be in saying it has to be at least a set size?
The key questions are around is this a place you would go to find out local information and is it about that and not just a type of advert board.
Then as always which way does it go enough to be ok or is it totally useless so aim to reject.