Which public transportation systems were introduced to improve travel within Marseille?

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View of the old port of Marseille, France, with numerous boats docked in the harbor and the city's terracotta-roofed buildings rising up a hill, topped by the Notre-Dame de la Garde basilica. — Marseille Seaside view of the Old Port of Marseille, France.

To address the challenges of road congestion within Marseille, the city has implemented significant public transportation improvements. These initiatives include the introduction of two underground metro lines and a surface tramway system that serves portions of the eastern suburbs.1