From Roader's Digest: The SABRE Wiki
Primary routes are those considered of special importance in linking primary destinations. The primary route network forms an unbroken grid (if you don't count Northern Ireland!) in that every point on a primary road can be reached from every other point on a primary road without having to travel on a road which is non-primary.
Primary routes are not to be confused with A-roads in general, which can be either primary or non-primary in status. Although technically there is nothing to stop B-roads from being primary, none are. Neither should they be confused with Trunk Roads which are roads owned and maintained by the national or devolved governments around the UK. Although trunk routes are usually always primary roads (and motorways), many primary routes are maintained by local authorities.
Primary routes are signed with green backed signs and will appear as green on many road maps.
This category has only the following subcategory.
Pages in category ‘Primary Routes’
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