What is it?
I must confess something: I find it really delightful when digital signage fails. It’s fun to see behind the curtain!
This made me think, though, that real signs should also be able to crash.
(Apologies for the pun.)
Printed on 3M Engineer Grade prismatic retroreflective film on aluminum. This film meets and exceeds the ASTM D4956 Type I specification.