"Ionut Radu - (p)" <ionu...@telenav.com> writes: > I was looking over residential roads in central area of Detroit and I > was wondering if some of them should be upgraded to a superior > function class (e.g. tertiary or secondary). > Lots of them are Avenues and Boulevards with at least two lanes and seems to > be major collector roads. > I think they were imported from TIGER Roads and some of them need a review > check.
Secondary typically is "state highway, or road that is important as a state highway". That will be fairly rare. In rural areas, tertiary is typically a road that gets you to another town, or to a different local area even if not across a boundary. So the roads people use to travel to a place that's in a different 10000 people population center should be tertiary. That's too broad brush and not really right, but I suggest that following it leads to sane results.
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