Question: What is the purpose of a traffic circle?

context: Modern roundabouts observe various design rules to increase safety. Compared to stop signs, traffic signals, and earlier forms of roundabouts, modern roundabouts reduce the likelihood and severity of collisions greatly by reducing traffic speeds and minimizing T-bone and head-on collisions. Variations on the basic concept include integration with tram and/or train lines, two-way flow, higher speeds and many others.
question: What is the purpose of a traffic circle in terms of safety?
short_answers: reduce the likelihood and severity of collisions greatly
context: A roundabout (also called a traffic circle, road circle, rotary, rotunda or island) is a type of circular intersection or junction in which road traffic is permitted to flow in one direction around a central island, and priority is typically given to traffic already in the junction.
question: What is the purpose of a traffic circle in terms of how it establishes a flow of traffic?
short_answers: traffic is permitted to flow in one direction around a central island
context: No context provided
question: What is the purpose of a traffic circle in terms of environmental benefits?
short_answers: potentially leads to less pollution

Answer: A traffic circle has multiple purposes. In terms of safety, traffic circles reduce the likelihood and severity of collisions greatly. In terms of environmental benefits, it potentially leads to less pollution. Its purpose in how it establishes a flow of traffic is that traffic is permitted to flow in one direction around a central island.