It makes perfect sense to make it a large sign; I remember several news items about tall vehicles getting trapped under it over the years.
It's not just the overall size of the sign that I find interesting, it's the proportions of the width of the 'road' lines compared to the stock 'low bridge' element they've incorporated, with no other information on the sign.
As a graphic designer I must admit to being a bit fascinated by this sort of stuff, especially the Worboys / Kinneir & Calvert signage system. Particularly when the rules are ignored/flouted (which is frequently).
It's not just the overall size of the sign that I find interesting, it's the proportions of the width of the 'road' lines compared to the stock 'low bridge' element they've incorporated, with no other information on the sign.
As a graphic designer I must admit to being a bit fascinated by this sort of stuff, especially the Worboys / Kinneir & Calvert signage system. Particularly when the rules are ignored/flouted (which is frequently).
/nerd