After more than six years of construction, the multi-leg intersections at the Leipziger Dreieck south of the Lange Brücke Havel crossing were finally opened to traffic in mid-December 2025.
During this time, the BERNARD Gruppe planned and supervised all intersection traffic signals, both for the temporary construction phases with challenging traffic routing, and for the successively completed final upgrade at all five signalised intersections. This ensured a waiting time-optimised handling of pedestrian and bicycle traffic, faster turning of the tramway at the main railway station, and an effective coordination of inbound and outbound federal road traffic. The new traffic routing enables the tramway to be set up and turned around quickly and with minimal disruption, a contemporary service for pedestrians and cyclists that complies with the regulations, and a low-conflict and efficient handling of motor vehicles, including turning motorised traffic. Thanks to the optimised traffic flows, both private transport and local public transport benefit from greater safety, predictability and efficiency. Special priority was given to the realisation and safeguarding of reliable different green-wave relationships in the highly congested motor vehicle traffic, as well as the dominant cycling traffic, both including partly over-corner traffic flows at narrow intersection distances and specific degrees of control freedom at the individual sub-intersections. Close coordination with the relevant municipal departments and all external planning participants was a key factor in the success of the project. The BERNARD Gruppe was responsible for the traffic engineering planning, accompanied the implementation as part of the traffic signal construction supervision, and optimised the traffic routing during the construction phase. This important Potsdam infrastructure measure has created the conditions for a sustainable development of the main station.
Jörg Stowasser, BERNARD Gruppe
