https://thepittsburghmarathon.com/Files/Admin/Marathon_ESCAPEGuide_2019.pdf?d=2019410153119.
Essentially it's a big loop. If you know you need to drive somewhere inside the loop before around 1 pm, you want to make sure your car is parked inside the loop, and vice versa.
Also, don't forget that the HPCC is hosting a cheering section from 8 am until noon at the corner of Bryant and Highland. Come out and cheer these amazing athletes as they hit the 20 mile mark!
Stephanie