When I wrote the first “What is a Bridge?” post, I felt confident that Merriam-Webster’s definition of a bridge, “a structure carrying a pathway or roadway over a depression or obstacle,” was sufficiently explicit to exclude ramps. However, while crossing the Penn Avenue Bridge in East Liberty I found a new structure to challenge the definition of a bridge.
The former bus ramp from the former Penn Avenue (Bus) Station to the (not former) East Liberty Busway Station meets the above definition of a bridge as it carries a roadway over the obstacle presented by the railroad bordering the busway. On the other hand, it also meets the definition of a ramp, “a slope or inclined plane for joining two different levels,” as the busway is significantly lower than most of the surrounding area. So, is it a bridge or a ramp? It almost feels like asking is a tomato a fruit or vegetable? or perhaps even which came first, the chicken or the egg? Are these equally impossible questions to answer or is it rather the case that there are exceptions to every rule? There aren’t always easy or straight-forward answers. I suppose in this case the structure is both a bridge and a ramp.
Perhaps a way to answer the question a little more specifically is to look at the way it is used. In its previous use, the point of the structure was to get buses down onto or up out of the lower busway level. While it was used in this fashion, I’d say it was more a ramp than a bridge. There is a future plan for it to be turned into a pedestrian bridge to transport pedestrians safely across the railroad and busway to the busway station (see Busway Bridges: East Liberty). At that point, in function the structure will be more of a bridge, though I suppose the ramp end will still function as a ramp to provide an accessible route to the station. Whether it is a ramp or a bridge, I did not walk it yet as it is not currently designed for pedestrian access. After its conversion is complete in the next couple years, I will come back to walk it.
Other posts in this series:
What is a Bridge? Pittsburgh Edition I (July 18, 2012)
What is a Bridge? Chicago Edition I (April 18, 2013)
What is a Bridge? Chicago Edition II (February 1, 2020)
What is a Bridge? Bethlehem Edition I (July 1, 2020)
What is a Bridge? Bethlehem Edition II (July 15, 2020)