HERTFORDSHIRE. Slipform paving machines laying a road surface during widening works on the M1, showing concrete being tipped into the machine in the foreground.
Starting in 1981, widening work was carried out on the M1 between Junctions 5 (South Watford) and Junction 8 (Hemel Hempstead). The aim was to convert the
existing two-lane carriageways from Junctions 5 - 7 and three lane carriageways from Junctions 7 - 8 into three lanes southbound, three lanes northbound from Junctions
5 - 6, and four lanes northbound from Junctions 6 - 8
Copyright © Historic England Archive. John Laing Photographic Collection
Credit: A© Historic England Archive. Joh