Having learned to drive where the shoulder is best used as a passing lane, stopping at red lights is optional and right-of-way is determined more by who is first to blow their horn or flick their high beams... I'm not the expert on the rules of the road. That said, I was born in the land of traffic circles otherwise known as New Jersey.
New Jersey-bred homosapiens, from birth, are forced to adapt and survive in a traffic-circle world and so it's almost part of our DNA. Unfortunately, this is not true for their neighbors across the river whose namesake is William Penn (nor for our friends from across the boarder, but you'll have to ask Brother Tim to tell his story). Even more unfortunate, someone in government decided a traffic circle be placed north and east of the Lancaster airport. And I'm further convinced that this circle is likely THE ONLY CIRCLE within 200 square miles, and possibly even the only such cunundrum in Pennsylvania.
I haven't bothered to look up in the Driver's Manual the proper standards for navigating a traffic circle, so don't quote me on this, but judging by the Yield signs at every entrance to the circle, all vehicles IN the circle have the right of way. All vehicles wishing to enter the circle must yield to the traffic in the circle. In otherwords, should I choose to drive around the circle incessantly, all traffic would have to yield to me. And, yes, I've done that at least once. This traffic pattern is lost on Pennsylvanians. The circle throws them for a loop, yielding to traffic waiting to enter the circle, yielding to traffic leaving the circle, yielding for the sake of yielding. Oh, and once in the circle, it's at least courteous, if not necessary, to signal when you're going to exit the circle.
And so it is, somedays up to four times a day, the little blue van that could is the only witness to a lesson on driving in circles. To the outside observer the driver's lips are moving, but the sound and message is lost on the intended audience.