Tangentialkreisstelle

A Tangentialkreisstelle, literally “tangential ring intersection”, is a type of road junction used mainly in German-speaking regions. It is designed as a multi‑way intersection where all connecting roads meet at a circular, tangential layout rather than a simple crossroads or cloverleaf. The key feature is that the incoming lanes of each connecting road are directed tangentially around a central roundabout or ring. This allows vehicles to merge onto the ring, circulate around it, and exit onto any of the connecting roads.

The design of a Tangentialkreisstelle reduces the number of conflict points compared to a traditional signalised intersection. Because each lane merges onto a single traffic circle, turning movements are handled by left‑hand turn lanes or intermediate off‑ramps that join the ring. The shape aims to balance the flow of traffic, easing congestion on major through‑routes while still providing access to side streets.

Typical applications include moderate to high‑traffic corridors where a fully controlled intersection would be too costly or would interrupt traffic flow. In many German autobahn networks, Tangentialkreisstellen are preferred over conventional cloverleafs or diamond interchanges because they occupy less space and have lower overall construction costs. They also tend to be safer, as the central ring requires vehicles to slow down, thereby reducing the severity of potential collisions.

Examples of Tangentialkreisstellen can be found near Berlin’s Brandenburg Gate and in the Rhineland, where the ring interchanges serve both commuter and freight traffic. Their effectiveness largely depends on proper lane markings, clear signalling, and adequate signage to guide drivers safely around the ring before exiting onto secondary roads.