Soft engineering techniques, used to prevent soil erosion and stabilise steep cuts and embankments, have allowed engineers to successfully widen the M1 motorway in the UK. Over the 50km length of the work (25km northbound, 25km southbound) on a busy section of the motorway near the city of Nottingham, a total of 48km of slopes had to be modified, split roughly between cutting and embankment. The UK Highways Agency requirements for the work meant that wholesale widening of the corridor was not possible: the
