In many of Lviv’s old buildings there is a carriage entrance way, a driveway which led from the street to the courtyard for carriages to pass through. Along the sides of the entranceway there is an elevated platform, which acted as a sort of sidewalk for people to be able to walk past a carriage or other vehicle in the driveway. I believe it also acted as a curb for the carriage not to bump into the walls, holding a similar purpose as the guard stones, which often flank the doorways. Maybe it could have also been used as a carriage step.
Most are stone, but I have come across a few wooden ones.