While the definition of "important" and "minor" will vary from state to state based on local norms and conventions, it is important to maintain integrity of the connected road network as a whole, without creating "islands" of road with a higher classification than the roads around it. ![]() When highway= primary is added to this collection, the network should include minor population centers, and so forth. Values of highway=* should be selected such that the collection of roads at each level (and above) represent a contiguous network of roads suitable for vehicular travel.įor example, the collection of all highway= motorway + highway= trunk should comprise a network of roads connecting all important population centers. All lower levels from highway= trunk to highway= residential are based on their importance to the road network.īecause the United States does not have a firm, nationwide highway classification system which maps 1:1 with these values, local communities must assess the importance of the various roads in each local road network. It is important to note that the values of the highway=* tag come from the British road classification system, but globally, they are applied as hierarchy of descending importance with highway= motorway being the only level that demands compliance with physical construction standards. Because OSM is a global map, it is important that there is consistency locally, regionally, and globally in how roadways are slotted into the 7 highway=* levels the general-purpose road network: In OSM, roadways are primarily categorized using a highway=* tag that indicates the roadway's importance in the road network.
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