> (1) You need to memorize the order of the streets (... Vine, Race, Arch, Market, Chestnut, Walnut, Locust, Spruce, Pine, ...), which is mildly annoying but yo

> (1) You need to memorize the order of the streets (... Vine, Race, Arch, Market, Chestnut, Walnut, Locust, Spruce, Pine, ...), which is mildly annoying but you just have to do it once. A complication - there are multiple series of streets, for example that series continues ... Lombard, South, Bainbridge ... east of the Schuylkill but ... Osage, Larchwood, Cedar, ... west of it. This sounds like the worst possible implementation, or at least one of the worst existing implementations, of a grid. The navigator just has to know all the randomly assigned street names and their relationships - in other words, maximum cognitive load. It could only be worse with special rules, like streets changing names from one block to the next, which also apparently happens. (Not shitting on Philly - my city is just as bad or worse) > (DC's solution to this is good although boring - the streets are lettered.) Essentially the same as NYC's then. It's predictable, has minimal cognitive load. If you can see any two parallel streets you can determine direction.