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Table 3 MDOT National Functional Classification (NFC) code road classes

From: Evaluating Michigan's community hospital access: spatial methods for decision support

1 – Rural Interstate (principal arterial) 11 – Urban Interstate (principal arterial)
2 – Rural Other Principal Arterial (non-freeway) 12 – Urban Other Freeway (principal arterial)
5 – Rural Other Freeway (principal arterial) 14 – Urban Other Principal Arterial (non-freeway)
6 – Rural Minor Arterial 16 – Urban Minor Arterial
7 – Rural Major Collector 17 – Urban Collector
8 – Rural Minor Collector 19 – Urban Local
9 – Rural Local 0 or uncoded – not a certified public road