The Watford and South of St Albans—Redbourn—Kidney Wood, Luton, Special Road Scheme 1957 (Variation) Scheme 2009
Since the construction of the M1 and the M10, there has not been a convenient route for non-motorway traffic to travel between St Albans and Hemel Hempstead. As part of the recent M1 6A-10 widening scheme, non-motorway Trunk Roads parallel to the M1 were built. This means traffic leaving the road currently known as the M10 motorway can access the local road network without joining the M1.