That chapter opening artwork of the cart heading to the walled city on that "road" really really bothers me. First, it looks more like a dry creek bed than an actual road. Then, the width of the thing. It's literally only wide enough for a single cart or wagon. And the way it looks like a depression, it seems like it would be a total bitch to try and get off the road to make way for another vehicle.
Sorry if I'm nitpicking something others don't find very important, but come on man! Pay attention to details a little more, mangaka!