Imagine you are a transport planer deciding on the construction of another underground line in Vienna. There are already six.
Where would you build a seventh one? Which areas of the city should be connected to each other, in your opinion? Where should the line intersect with others? Underground lines connect densely populated areas with each other or open up new parts of the city.
Care must be taken when choosing a route due to the high costs associated with a new underground line.
