battery operated lights like DON suggested is a great idea...i haven't done it yet, but i think i will before i go out again, it's easy to clip a flasher to the seat post.
the back of my 3/4 helmet has an integral light w/off,on slow,flasher style.
years ago i had of a honda goldwing rider getting killed at the light from a cager rear ending him.
w/lane splitting/filtering he would have prolly stayed in the target zone because baggers act like cars.
a skinny moped would maybe have been in front of that hot mess?