I see you’ve thought about this.

I’ve just seen one too many winters with icy roads and cars being stuck and (temporarily) abandoned making roads between towns unusable for a while.

I imagine that but worse with everyone fleeing the city and getting turned, being unprepared for a journey, running out of gas all over the place - not just cities. Maybe they can go off-road and get around a perpendicularly abandoned vehicle or two but eventually there will be an obstacle no truck can bridge.

So for me, I think two wheels for mobility. But that would also depend on what kind of zombie and what kind of apocalypse. Are they fast or slow; do they hunt by ear, sight, smell; is it almost instantaneous or after a year-long pandemic, do they travel in pack or avoid each other, how do they perish, etc.

How would you navigate that through streets full of abandoned vehicles and debris? A bicycle is quiet, faster than a human or zombie, easy to service, easy to navigate and even carry where it can’t go, and don’t require fuel. If you want something faster and fuel driven, a motorcycle would be better than any car.