In short, a proper module is a black box, responsible for an independent flow (i.e. process). Other modules act upon it via its programming API (i.e. calls to class methods). And it doesn’t allow other modules to query its datasource directly (by bypassing the API).
Their patterns are also consistent at this point:
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Crucially, this distribution of border points is agnostic of routing speed profiles. It’s based only on whether a road is passable or not. This means the same set of clusters and border points can be used for all car routing profiles (default, shortest, fuel-efficient) and all bicycle profiles (default, prefer flat terrain, etc.). Only the travel time/cost values of the shortcuts between these points change based on the profile. This is a massive factor in keeping storage down – map data only increased by about 0.5% per profile to store this HH-Routing structure!
"I get that scepticism. It's earned, not just toward us, but toward the entire tech industry," Vishnevskiy wrote.