There's a trail I like to ride on in Utah that's an old railroad grade. It's part of the Great Western Trail now, but is not heavily traveled by hikers. I've ne

There's a trail I like to ride on in Utah that's an old railroad grade. It's part of the Great Western Trail now, but is not heavily traveled by hikers. I've never seen a single other hiker or biker on the trail. It's overgrown now, and has narrowed down to a singletrack trail. But it's easy to ride on, even without a fancy full suspension bike, because over 100 years ago, it was graded for a railroad, so it's a gentle slope, and all of the big boulders were removed. Even though it's been derelict for a century, it's still gentle sloped and mostly free of big rocks. Most of it is overgrown with shrubs, but the occasional hiker is enough to keep a footpath clear. It could be ridden even with a city commuter bike along most of it. In a post-apocalyptic world, bicycles would definitely be a great way to get around. The roads would get cracked and overgrown, but with moderate traffic, they'd develop into smooth single track trails. What to do once you run out of tires and tubes would be the bigger problem.