The message that is given by a sign and its graphic diagrams needs to be clear, with an ease of reading appropriate to circumstance. The sign that tells of restrictions on dog defecations in Dublin is immediately understood, even with the language barrier.
However, the traffic sign that advises on safe head heights and optional routes remains a puzzle even to the static eye. Just what a passing motorist would make of this scattering of information as the vehicle moves on in the traffic flow, remains unclear. Decyphering messages of such importance needs a graphic rendering that is as instantly understood as that designed for dog owners, where, ironically, immediacy is not that critical. Well, it may not be.