Import intersection control devices

[1ec5]

The City of San José’s Department of Transportation and Department of Public Works publishes a street intersections layer that indicates whether each intersection is signalized and, if not, which directions have stop or yield signs. This dataset is in the public domain as a work of a California local government agency. We should ensure that OSM has all these intersection control devices covered.

It should be possible to join this layer to OSM to find the intersections that aren’t near any highway=traffic_signals, highway=stop, or highway=give_way node. For these intersections, we can create a MapRoulette challenge to map intersection control.

This layer also contains the traffic signal activation dates mentioned in #43, but I don’t think we have enough information to import the full street intersections layer into OpenHistoricalMap.

/ref streetcomplete/StreetComplete#493