The TIP is the Transportation Improvement Plan for all of Southwest PA, as compiled by the Southwest Pennsylvania Commission (SPC). Short version: If you want your transpo project to be funded, it needs to be on this list.
http://www.spcregion.org/trans_tip_sched.shtml
That page is HTML, but the whole thing is a large PDF.
From the page:
The current official transportation program for SPC is the 2011-2014 TIP effective through September 30, 2012.
The NEXT TIP (2013-2016) will become effective on October 1, 2012 and include fiscal years 2013, 2014, 2015 and 2016. For projects not already included in the 2011-2014 TIP, this will be the next opportunity for a candidate project or next phase of a currently programmed project, to be considered for federal or state funding.
So, these things are produced in an on-going four-year cycle. I recommend becoming familiar with the process. Even if you aren't going to be in Pittsburgh, pretty much the same process is followed U.S.-wide for getting projects done.
I haven't looked at it myself, but I recommend going over it (as I will later) to see what IS on there and what ISN'T on there.