[bonzog]

It's not quite the same thing - the EMAS is the overrun surface itself, rather than the signs warning of it. However you are quite close to the money on another aspect of airfield design.

Lots of obstructions near the runway - signs, lights, aerial masts, meteorological equipment, fences - are supposed to be "frangible" [1]. They must break into pieces less likely to cause damage to an aircraft in a high-energy collision. There's a heck of a lot of GFRP used in lieu of metal around an airfield.

1. ICAO Doc 9157, particularly part 6.