liikenneympyröihin

Liikenneympyrä, commonly known as a roundabout, is a type of circular intersection designed to regulate traffic flow. Vehicles entering the roundabout yield to traffic already circulating within it. This continuous flow of traffic, as opposed to the stop-and-go nature of traditional intersections, aims to reduce delays and improve safety.

The design typically involves a central island around which traffic circulates counter-clockwise in countries where driving is on the right, and clockwise where driving is on the left. Entry and exit lanes are designed to channel traffic smoothly. The speed of vehicles is naturally reduced due to the curved path and often a narrower roadway.

Studies have shown that roundabouts can significantly reduce the severity and frequency of accidents, particularly those involving T-bone collisions and head-on impacts, which are common at traditional intersections with traffic signals or stop signs. Pedestrians and cyclists are also often accommodated with dedicated crossings before entering and after exiting the roundabout. While initial driver unfamiliarity can be a factor, most drivers adapt quickly to the system. The implementation of roundabouts is a common traffic engineering strategy in many countries.