Firstly, some paths took on one or both of the following models: they instrumentalized other forms of passible space, such as parking lots, school yards or parks and/or made a very quick connection between what would otherwise be an extremely inefficient and unrealistic sanctioned route. The problem with both instances is that it required some guess work on my part to determine what the likely trajectories were. Ergo, this survey is not entirely objective. Apologies.

In addition to the macro-urbanist concerns discussed previously, which make Baltimore particularly prone to this phenomenon, paths tended to occur with highest frequency in those areas surrounding downtown but not on the outer perimeter of the city. Where as the space downtown is more similar to the previous examples of DC and New York, in the outer perimeter of the city, where architecture frequently does not share a wall with its neighbors, passible space is often "someone's lawn". The dense residential spaces between, which often have a high vacancy rate, represent the typical subject.

Some paths noted in the original scanning of the aerial photography have been omitted because they appeared, on second inspection, to be officially sanctioned, or because the connection they presented could not be determined.