I'm currently trying to form a sort of consensus as to the best way of defining the classes of highway in the US, and a bit of information about the UK would help. I know about the definitions used (trunk=primary route network, primary=A roads, secondary=B roads), and have a few questions. *Is the tagging of motorway through secondary reasonably complete and accurate, such that OSM can be used to get a feeling of how dense the classes are and how they interrelate? *What's the difference between a motorway and a non-motorway built to motorway standards? I thought it was the ability to ban non-motorized vehicles, but apparently this can be done on non-motorways. Has it become simply a political distinction? *Are there criteria that the Highways Agency uses to define the primary route network (more specific than the general purpose of connecting major destinations) and the difference between an A road and a B road? Or are changes handled on a case-by-case basis? Thank you for any information.
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