The construction of the A1 (M) Darrington to Dishforth DBFO road scheme has provided an important opportunity to investigate landscape development over time in parts of West and North Yorkshire. Over sixty archaeological sites were investigated in advance of and alongside the massive engineering works in one of the largest programmes of archaeological fieldwork seen in the UK. The results of the work will greatly enhance understanding of the archaeology of the magnesian limestone areas of West and North Yorkshire. The most significant results are presented here in this book funded by the Highways Agency as part of its commitment to the historic environment and dissemination of work undertaken on its behalf.