 From Watford, the road was to become dual carriageway heading east until it met Ringway 3 near Navestock in Essex.The designation for the motorway section was M25.Construction began on the first section of the motorway between Godstone and Reigate (junctions 6 to 8) in 1973 and included a junction with the M23 motorway which was under construction at the same time.