The annoying signs you find at the side of the road provide a lightweight wire frame that hold a small reflector made of corrugated plastic.
You're also cleaning up the roadside of those crappy looking signs.
Earplugs are absolutely essential. When I'm going to a noisy event, then I pack in a pair of etymotic research er-20 'plugs. I can photograph and come out with intact eardrums afterwards.
Black gaffers tape is something that I can't get enough of in the darkroom.