|Length:||26.6 miles (42.8 km)|
|Met:||A61, A19, B1257, A169, A170|
|Now part of:||A170|
|Route outline (key)|
The original route of the B1256 was the road between Thirsk and Pickering in the North York Moors.
It is possible that the gradient of Sutton Bank (even today a 25% gradient and prohibited to caravans) denied the road Class I status in 1922. However, its importance soon overruled this and it became a western extension of the A170 in the 1920s. Apart from a few bypasses, for example of Kirkbymoorside, this remains the situation today.