Other than all of the stuff you mentioned, a way to signal the road when you are over the side would be nice. I have been involved many times in looking for someone who is over the side and on the cell phone with my dispatch. They NEVER have a clue where they are, so we usually end up driving "code three," and dispatch will ask them if they hear the siren. Usually their cell batteries die before they hear us. I have always thought that, in addition to a good light for signalling at night, if one of those canned air horns might be heard by someone up on the road. A can of common sense would be nice too, but no one sells those yet.