[10redrocket]

There are toll booths only when you get on or off.
As far as speed, to be safe about 5mph over limit is acceptable.
Cops generally sit in the maintenance access roads 90% of the time, especially going over the Appalachian mountains.
Occasionally they sit on the back side of overpasses.
On rare occasions they'll sit just over a hill if the shoulder is safe.

Best drive time is early morning, say sunrise. Sunday's are also good if not a holiday weekend. I avoid driving at night as you cannot see the cops till its to late.

If there is no shoulder or it is narrow, you can go as fast as traffic will allow as it is not safe for the cops to pull you over there. Hence, no cops.

There are long straights after you get over the mountains that allow you to see ahead a good ways. Again, as fast as traffic allows.

I drive the pike several times a month so I know where the cops sit. I make very good time as 25 mph over is very doable.

Around Pittsburgh, Harrisburg and Philadelphia at rush hour should be avoided.
Good luck.