start approx. 3.5 miles south of boroughbridge, in entrance to a168 from old a1 (now a long layby) at a point approx. 1 yard before "clearway" sign. turn left on to a168, and proceed south to walshford traffic island (4.72 mls). encircle island and retrace north along a168, past start, to boroughbridge south traffic island (12.27 mls) encircle island and retrace south on a168 to walshford ti (2nd time) (19.86 mls). encircle island and proceed north on a168, to finish at northern end of crash barrier protecting road direction sign, on west side of road, approx. 150yds south of arkendale road (25 miles).