It's also possible that traffic engineers would make different design choices about PennDot's urban routes if they had more personal exposure to them. In programming, there is a slang term called "dogfooding," which holds that programmers who have to use the software they're designing will make better decisions about how to build it. PennDot engineers might design urban streets in Philadelphia and other cities with more empathy for pedestrians if they had to eat their own dog food and personally navigate streets like Market, JFK, and the Parkway on foot every day.