Regarding signal lights, etc...there have been some good rescue reminders/advice posted here, stimulated by the discussion of how to avoid being a statistic.
If you’re stuck in the remote wilds and have already changed out a flat, and you don’t have or can’t use a tire repair kit on the damaged tire, remember that you now have one pretty worthless tire you can set on fire to create a very noticeable plume of thick, black smoke and also some flames visible hopefully in the dark. Just try not to set the woods, etc., on fire too.
I served in the Army about a bazillion years ago and was reading this thread earlier and wondering whether colored smoke grenades were legal for me to own... though living out West I'd worry a lot about setting the place on fire...