I had a bridge the people walked on for 15 years with 3/8 lexon, last year took it apart and is now a drop down window. Lexon is also used in sawmills for the saw box's because of its impact resistance.
I used 3/4 plexiglass for a floor display once. I should have used Lexon. The plexiglass scuffed up right away.
I heard an actor went through a bulletproof glass floor display in Brigantine Castle in the 80s. That might just be an urban legend.