Ralf Herrmann, on the design of his (excellent, to my eyes) signage typeface Wayfinding Sans Pro:
So I set off, driving thousands of miles across Europe to
explore the legibility of these signs and typefaces, first hand.
Once I even ended up in a holding cell at the border crossing to
Norway, because the customs officers just wouldn’t accept that
someone would drive all over Europe simply to take photographs
of traffic signs.