Two-level Structure for Tram and Road Traffic in the Centre of City – Lodz in Poland

In the article are presented modern and economical solutions for reducing time of passing by and for improving attractiveness of the old part of the city. Transit road is designed on an underground level (lower part) with distribution ways (ramps-on and ramps-off) to the ground level (upper part). Tram traffic stayed on the ground level with track beds over tunnels or directly on cantilevers structures. In the article are presented results of complex engineering calculations and choice of economical, structural and functional final arrangement.