I e-mailed Avery a week or so back to see if they could offer a muted reflective silver material for the graphics, like you sometimes see on running shoes that glow softly (not brightly) in the dark for increased visibility during evening walks. On a camper, it would be silver graphics by day, increased visibility when traveling at night. Not sure if something like that would be legal throughout all of North America, though. I have not heard back from Avery. Probably won't. But I thought I'd at least ask them about the possibility...