The queue for mourners to pay their respects to Queen Elizabeth II was one of the biggest in history, with 250,000 people waiting up to 24 hours, in a queue 16km long.
A team of experts had been planning for this expected queue for many years in a project codenamed 'Operation Feather'.
Professor Keith Still advised on the project, as well as 'Operation Marquee' and 'Operation Unicorn'. His expertise in queueing theory blends mathematics with behavioral psychology and is used around the world; at sports games, religious festivals and theme parks.
Kathryn speaks with Professor Keith Still, a visiting professor in crowd science at the University of Suffolk, who has taught and advised on crowd science for 30 years and has lectured at the Cabinet Office Emergency Planning College.
People in the queue to file past the coffin of Queen Elizabeth II in Westminster Hall. Here the queue winds down the embankment towards Lambeth Bridge in central London. Photo: RNZ / Nick Monro
