In fact, when I'm driving, I'm often critically appraising the lettering on vans and lorries, even that written with a finger in the dirt!
Anyway - this was an unexpected pleasure, on a walk from Skelwith Bridge in the Lake District, at Park Farm. There was no explanation for it - it's just there!
That's what we need on the road! (Actually, no lorries would be preferable, but interesting lorries would be good too.)