Hertfordshire Police say they are trying to establish the cause of death.

National Highways had earlier warned of about seven miles (11km) of congestion on the motorway.

National Highways says the "essential maintenance" work is set to take place over four days.

Police say the body was found by National Highways road workers.

National Highways says delays in the area will clear.

Claire Mercer has asked the transport secretary to end "madness" of motorways with no hard shoulder.

A joint police and National Highways operation records 190 offences committed behind the wheel.

A lorry on fire has led to the M1 closing on the northbound section.