1- 8 1s+2s circle 4H round to left and end in centre facing other couple, 1s+2s set 1s turning inwards to face up, dance up and 1s cast to 2nd place
9-16 1s+3s repeat with 1s casting to 3rd place while 3s end in 2nd place
17-24 1s dance up to top and cast to 2nd place own sides, 1L crosses up and casts to 2nd place opposite sides while 1M crosses down and casts up to 2nd place
25-32 1s dance reels of 3 on opposite sides (RSh to 2nd corners to start) and cross RH to 2nd places
(MINICRIB, Dance Crib compiled by Charles Upton, Deeside Caledonian Society, and his successors)
This dance was named after the A70, a major road in Scotland, United Kingdom. It runs a total of 74.3 miles (119.6 km) from Edinburgh to Ayr and it is colloquially known as the "Lang Whang".
For the other meaning see the Scottish Wikipedia entry; Lang Whang