Andorra to pilot turbo‑roundabouts at two busy junctions

The transport ministry will begin a pilot in January to convert two of Andorra’s most congested roundabouts — Prada Casadet and the KM0 — into turbo-roundabouts, a layout not previously used in the country.

Under the new arrangement the outer (right) lane on both approaches and exits, in both directions, will be restricted to going straight or turning right; left turns and U‑turns will be prohibited. The change is intended to simplify manoeuvres within the junction, reduce conflict points and improve traffic flow.

The measures are aimed first at cutting accidents at these high‑risk junctions and second at easing congestion. Both roundabouts will receive new horizontal and vertical signage and illuminated panels to mark them as sites with recurring collisions and to guide drivers through the revised lane rules. Authorities have also stressed the need for driver education on proper lane use inside the roundabout, noting, for example, that the central lane is not for right turns.

Secretary of State for Transports, Mobility and Energy Transition David Forné announced the pilot after a Mobility table meeting attended by political and technical officials, the consuls of all parishes, and representatives of the police and COEX.

Officials expect the redesign to be effective. The trial is planned to run for several months — no precise duration has been fixed — and, if results are positive, the turbo‑roundabout configuration could be rolled out to other pressured points in the road network.