Because they are ramps. Ramps generally have destinations (be it streets, neighbourhoods or other places) instead of names. If they service surrounding buildings, then it's not really a ramp, is it?

In this case, there are signs on all four sides which show various destinations, which I'm going to add.

P.S. The parking spaces and access to the buildings on that side are likely "заварено положение" from before the bridge over the junction.