Sparrows Herne Turnpike Road
Sparrows Herne Turnpike Road from London to Aylesbury was an 18th-century English toll road passing through Watford and Hemel Hempstead. The route was approximately that of the original A41 road; the Edgware Road, through Watford, Kings Langley, Apsley, the Boxmoor area of Hemel Hempstead, Berkhamsted, Northchurch, Cow Roast and Tring.
Source: Wikipedia — Sparrows Herne Turnpike Road (CC BY-SA 4.0)