Now I want to talk about the highway system I would like to see in 2050. While the Philadelphia highway network is largely built-out, it is by no means in an optimal state, and in fact, the national trend of ongoing outer-edge investment over core and inner-suburb investment--the trend that held true until 2008 and that Tea Partiers are vainly and idiotically trying to reboot--has guaranteed that projects left unfinished by previous generations remain unfinished--even when they are enormous assets.
In the long term, of course, these projects would be financed via the bonds and tolls system common in the United States prior to the advent of the Interstates. Indeed, a dismantling of the current Interstate funding mechanisms (which ceased to be self-sufficient some time ago) in favor of a partly-public partly-private bonds-tolls system, in which existing highways are leased or sold off to private entities, who would then be in charge of maintenance*** and new starts would be funded by bond issues, paid for by tolls, and then leased/sold off when paid off, is my long-term road policy recommendation.
* While Center City's office market usually shows between 75% and 90% occupancy, in fact the total amount of office space in Center City, over the past twenty years or so, has been subject to a number of downward adjustments, due to condo and apartment conversions of older office buildings (the most spectacular being perhaps the Aria at 15th & Locust and the Residences at Two Liberty Place in an overbuilt section of former Cygna headquarters). By my estimation, there is now only about half as much office space available in Center City as there was in 1990.
** Industrial access to the Richmond Marine Terminal being the main reason why it's not being dismantled further, all the way to the Betsy Ross Bridge.
*** This solution, note, is truly libertarian. For a Tea Partier, proposing this solution for roads would be political suicide. Again--the Tea Party is not libertarian, but rather a form of radical populist conservatism veiled in libertarian-esque language.