We have similiar accidents here in Southern California. Cars go over the steep canyons into heavy chapparel. Some are only found years later by hikers or after a brush fire.The best chance,given limited visibility for mirrors and flares and poor signal reception, is audio. I carry a whistle and one of the portable marine horns . These are powered by disposable cartridges. This is assuming someone is close enough to hear you, and has the presense of mind to recognize it as a distress call.So, just like a marine or arial journey; let somebody know where you are and going ( even if its just a note) and carry a few supplies. Often overlooked,is practical footwear. I had to walk back from a disabled car in the middle of nowhere. I had plenty of gear, but high heeled cowboy boots made short work of my feet!<br><br>