text: It isn't the same as the HA definition. OSM uses 'trunk' to refer to 'primary routes' (the ones with green - rather than white - signs on the road: http://wiki.openstreetmap.org/wiki/United_Kingdom_Tagging_Guidelines#UK_roads 
  OS Opendata Vectormap shows both 'legs' of the A570 as primary which suggests they both ought to be 'trunk' in osm. 
  Could somebody please check the signs on the ground and update accordingly?
  