Most primary routes (the ones shown in green on maps) are covered by SABRE's descriptions of A roads numbered 1-999.
The first ninety-nine can be found here, and the three-digit roads can be found here.
Quite a few 4-digit A roads are primary too. This is a reasonably accurate list, but there are a few roads that need to be added. Very few of these roads have online route descriptions, so please add a description for any road that appears in red.
--Dadge 02:56, 21 Feb 2005 (GMT)