I used to use the Herman's safety flag (wing). It worked fairly well. However, when I started using Panniers 100% of the time, it seamed the safety wing barely stuck a few inches beyond. I just drifted away from using it. There is one "major-urban-collector" road on my winter commute that I hate. Interestingly, it is called Pleasant Hill Road. It is anything but pleasant. It has many industrial businesses and construction trucks. Last week an 18 wheeler blew his air-horn for me to get out of his way... Pretty intimidating. It's hard to build-up a thick skin... but it develops the more you ride.