On September 6, 1997 the normally gridlocked M1 at Luton and Dunstable was eerily quiet.
The road northbound had been closed to allow the funeral cortege of Diana, Princess of Wales, to pass through on the way to her final resting place at Althorp Park in Northampton.
Thousands of people lined the embankment as the cortege, with police escort, travelled up the M1 following an emotional funeral service at Westminster Abbey.
The Princess had been killed a week earlier, at the age of 36, when the car she was in crashed in an underpass in Paris.
Were you on the embankment? Why not let us know your memories of that fateful week. Our email address is firstname.lastname@example.org