Also they can be smaller and cheaper to build. Because they only carry bicycles and pedestrians, a height clearance of about 2.5 meters is enough, while a bridg

Also they can be smaller and cheaper to build. Because they only carry bicycles and pedestrians, a height clearance of about 2.5 meters is enough, while a bridge needs around 5 meters to let cargo trucks pass underneath. This also results in much shorter ramps.