Should be the same as everyone else... only on breaks and stuff, while you're working you need to be aware of your surroundings.
when I used to work for the park, I wear before and after work. From my car to the shuttle to Harbor Point and to backstage and back to my car. I used to wera everytime I was backstage cleaning 3D glasses of HISTA, Bugs, and Muppets.
Back a hundred years ago when I worked 3rd shift (midnight to 8am) we were allowed to listen to the radio with the ear buds, but we could only have one in and not both of them. I don't know if the rules have changed since then...
We had to use the FM?AM radios as it was in the days before the iPods. (No get off my lawn, you kids!)