Can you turn around at Maryland House and reverse your direction from S to North, or N to South?

Yes, in designed lanes for entry and exit

Yes you can.

Yes since you've already paid Toll.

Yes, from both directions. South to North & North to South. Easy to locate.

You can! N to S, S to N....heck, you could go wild and go from N to N or even S to S....but really, yeah you can. Its not one of those that you can only stay on one side of the highway.

Yes, can turn either direction