From OpenStreetMap Wiki
|route = bus|
|The route of a bus service.|
|Used on these elements|
|Status: In use|
|Tools for this tag|
This tag is used on relations which map the route of a bus service.
How to tag a bus route relation ?
|ref||reference||The reference by which the route is known. e.g. 4, 4A, X13, etc. (recommended)|
|operator||operator||Name of the company that operates the route.|
|name||individual name||The name of the route or line.|
|network||local / regional network||Name (abbr.) of the network; e.g., BVG, RMV. (optional)|
|wheelchair||yes / no / limited||Indicates if the buses on the route are low-floor busses for wheelchairs. (optional)|
|colour||ex: red / #FFEEDD||The "official" color for the bus route. identifiers in some cities. (optional)|