Ummmm, H24 stopbars have been around for a while now...
(I know there are some vehicle only entry/exit points at various airports which only have runway guard lights, “wig-wags”)
I’d be surprised, certainly in UK, if many/any airports have a procedure which states you can cross an illuminated stopbar without the express permission of ATC? If so I’d suggest that is, at the very least, a “latent risk”.
As for vehicle entry/exit points only protected by a wig-wag and a painted line...I guess it depends on local rules...but surely the only sensible one is “Don’t £€@&;^¥ enter, unless explicitly cleared”?