Heavily trafficked areas will change over time.
Small changes concerning balance, gameplay, or graphics.
Map generation and terrain modification.
Is this by design?
Disregard the part about tanks. I am still learning Lua and I see now that tanks and cars are of the prototype "car". But the question about spidertrons remains. Does it make sense for spidertrons to leave a path?
That is a good question. I don't know if spidertrons should cause wear. If so, they have a much different footprint than a person or tank does!