Wow. Some of you guys are really prepared!
I have picked up on a few tips:
--Keep a headlamp in the vehicle. I don't think there is a more useful tool when you need both hands free to work on something, and a headlamp, unlike a work-light, puts the light pretty much exactly where you need it.
--Keep a flashlight with a red cone on it for directing traffic. While this is more a job for LEO's, in an emergency you may be the immediate responder, and have to do that duty.
--Keep a magnetic work-light in the car. In addition to your personal headlamp, you may not be alone, and having a magnetic work-light along can help with general illumination of the vehicle and area. It also serves as a sort of backup to the headlamp in case it fails.
--Keep a giveaway light in the car. I had not really considered this until spending some time on the forum, but it is a good idea. You might come across someone that needs light, but you can't stop to help them, so being able to simply hand them a light and going on your way would be nice.
Keep posting folks, I'm learning good stuff here!