VBZ: Röntgenstrasse 32
Militär-/Langstrasse 31, 32

If you set out to walk from the 4th to the 5th District, you’ll normally have to go below ground. And if you take one of the two grey tunnels between Lager- and Zollstrasse, you’re best advised to stay on your guard. Because cyclists and pedestrians often stray o  the marked paths and invariably end up yelling at each other. So, if you have to use the underpass, be sure to let your eyes wander too.