Traffic conditions in the City of London 'square mile' before the implementation of the traffic restraint scheme are described. Plans to improve conditions were subject to a large number of constraints but were speeded up by the incidence of the terrorist bomb. The scheme involved a) 8 access points, b) 18 egress points, c) closure of 20 minor streets and d) the retiming of traffic signals to facilitate traffic flow around the core area. Brief details are given of the implementation of the scheme and its effects. For the covering abstract see IRRD 874870.