People occasionally use In-line skates, skateboards or other similar devices to tour around cities such as London and Paris. Such events are normally organized by a group of volunteers that operate in cooperation with the police and other local authorities, and would always use marshals to help control the traffic (see Road skating § Street skating.) The term suicide skate evolved to describe events where a group of around 5-30 people use In-line skates to tour around a city without informing the police or other local authorities and without using marshals to help control the traffic.