On 12/7/2011 7:08 PM, Andrew Errington wrote:
I don't know for sure, but I expect that the initial list of road
classifications were derived from UK Ordnance Survey classifications:
Motorway - motorway
A road - primary
B road - secondary
'yellow' road - tertiary
'white' road - unclassified
dual-carriageway - trunk
upgraded A road - primary + motorroad
"Motorroad" is a recent tag, and means that bikes and pedestrians are
not allowed (I don't know if this is always true on an "upgraded A
road"). Trunk was and still is (?) used for the "primary route network"
in the UK, which I believe use green on signs.
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