The dream was symbolism for the old generation being unable to leave a path for the younger generations to follow -- just imagine how impossible it would be to follow the torch of a man, long gone on horseback, through the night.
I'd talk about that some more, but I'm at work. :'[ You can just work from that and the title of the story.
That final scene showed his character lamenting over that unfortunate symbolism - and relating to it.
The car accident is harder for me to decipher... One thing I like is that he told the kids "You didn't see me." That can be taken as him telling the kids that they didn't see him, in case the cops ask... but it can also be seen as Chigurh bending the rules of his own sociopathic laws, where if anyone sees him, they're as good as dead. (I believe Harrelson made mention to something of that nature.)
I believe that Chigurh got away. I think the car accident both accentuated the fact that he was a "ghost" (or a force of nature; like a shark), being able to escape like that, but also human -- that he, too, was susceptible to chance (-> his coin