Not sure about Swat, Kaghan etc. But forget anything that passes through Bara Kahu (Islamabad).
2-3 weeks ago, it took me 2 hours to cross Bara Kahu alone, while coming back from Chattar. And traffic jams at many places even from Chattar to Bara Kahu. This was a normal weekend...!!!
At Bara Kahu, people were lifting their bikes from the road divider after deciding to cancel their trips and go back. You can imagine the state of car drivers.
Murree/AJK trip in eid holidays... hmmm. good chance to sleep in your car.