I am trying to understand why the output includes None in tracepoints. What do these mean?

[None, None, None, {u'waypoint_index': 0, u'name': u'West Washington Street',

And then the algorithm would return a coordinate sometimes without a street name. Are these erroneous output?

{u'waypoint_index': 26, u'name': u'', u'hint': u'eWK6g____382AAAAjwAAAAAAAAB-AAAADQAAACQAAAAAAAAAHwAAAJo5AAB55FH5-qL-AY3kUfkRo_4BAAAvE3jrEvY=', u'matchings_index': 0, u'location': [-112.073607, 33.465082], u'alternatives_count': 0}

closed as too broad by PolyGeo Jul 6 '18 at 4:50

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.


Referring to your second question: an empty street name is returned when the road where your original point snapped to has no name. In your example, the point is on a small service road without a name.

Your first question has been answered here: https://github.com/Project-OSRM/osrm-backend/issues/4871

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