Funny, this was the one episode so far this season I didn't love. I thought that it did very well on the symbolism in service of exploring its themes, but so little actually happened here. You can tell by your review, which is half as long as the last five, that the events of the plot were few and far between.
Maybe it's just me, but it seemed like things didn't happen for much logical reason. They went into Atlanta, which happens to be one of the biggest cities on the continent, and somehow managed to find not only the perfect piece of evidence crashed in the middle of a featureless road, but also ran across the one person from the hospital who can help them. I can usually strain my suspension of disbelief pretty far, but coincidences like these were too much for me.
I like that this detour gave us the opportunity for insightful character exploration, but I almost wish they had simply followed the car right back to the hospital and got down to the business of breaking Beth out.