Perhaps we could have [[tile]] types which are part way between [[packed dirt]] and [[gravel]] (and [[cobbles]] etc). So perhaps each RL day [[paving|paved]] [[tile]]s have a (very) small chance of becoming a sort of damaged version of themselves.
* Maybe 0.1% per day of [[gravel]] becoming [[mostly gravel]] or a [[mostly gravel]] becoming [[packed dirt]].* It would only take maybe 2kg of [[rock shards]] to [[paving|pave]] a [[mostly gravel]] into a regular [[gravel]].
* Other types of [[paving]] would have more steps before they become [[packed dirt]] of course.
This could be even less likely than that if it becomes impossible to maintain big roads... but I think that having to repair roads like we do for [[wall]]s and [[fence]]s would make sense. And all this of course would mean abandoned [[settlement]]s would be reclaimed by the wilderness a little bit more... which I think would be nice.
== Locksmithing ==