Where now the road is, once was a river. This river dried up while the sovjets where exploiting east berlin. The bridge is a reminder of these hard times. The river bed now flows cars, not water.
Also is Germany often struck by sudden floods these times. The street is below a certain level and the bridge makes sure that in case of floodings there is a way to pass the "river".
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haha funny but see the answer in the video!