Kaksikierron

Kaksikierron, also known as double roundabout, is a type of road junction that combines the features of a roundabout and a traffic circle. It is designed to improve traffic flow and safety by allowing vehicles to enter and exit the junction in both directions. The term "kaksikierron" is Finnish, and the concept is used in various countries, including Finland, Sweden, and the United States.

A kaksikierron typically consists of two concentric circular roads, with the inner circle serving as a one-way street and the outer circle as a two-way street. Vehicles entering the junction from the outer circle can either continue straight or turn left onto the inner circle. Vehicles entering from the inner circle can either continue straight or turn right onto the outer circle. This design allows for smoother traffic flow and reduces the number of conflicts between vehicles turning and those going straight.

Kaksikierron junctions are particularly useful in urban areas where space is limited and traffic volumes are high. They can help to reduce congestion, improve safety, and enhance the overall efficiency of the road network. However, they can also be more complex to navigate for drivers who are not familiar with the layout, and may require additional signage and markings to ensure clarity.

In summary, kaksikierron is a type of road junction that combines the features of a roundabout and a traffic circle, designed to improve traffic flow and safety. It is used in various countries and is particularly useful in urban areas with limited space and high traffic volumes.