échangeur

An échangeur, also known as a partial cloverleaf interchange or diamond interchange, is a type of road interchange that allows traffic to change direction without the need for a full interchange. It is designed to reduce congestion and improve traffic flow by allowing traffic to continue in a straight line or to turn left or right without merging onto a multi-lane highway.

The échangeur typically consists of two interchanges connected by a loop road. Each interchange has two ramps, one for entering the loop road and one for exiting. Traffic can enter the loop road from either interchange and exit at the other, allowing for a more direct route between two points.

The main advantage of an échangeur is its ability to handle high volumes of traffic efficiently. It reduces the need for complex merging and weaving maneuvers, which can cause delays and accidents. Additionally, it provides a more direct route for through traffic, reducing travel time.

However, échangeurs can be complex to navigate and may require signage and signals to guide drivers. They are most commonly used in urban areas or on major highways where traffic volumes are high. Examples of échangeurs can be found in many countries, including France, where the term is most commonly used.