Which circles are you talking about? The normal sized ones or the roundabouts?
EDIT: How do you think a mini-circle works?
I'm taling about the mini-circles in the residential areas, the ones all have yield signs.
My colleague was telling me you must treat the mini-circle like a stop street, hence you must always stop. That's when I said but then why not just use stop streets if you must stop, to which he said "Because you only have to stop if other cars are coming to the circle", which pretty much means yield signs which is what a mini-circle is.
My understanding is :
For traffic circles, I must yield to the cars in the circle coming from the right before I can enter the circle.
For the mini-circles, I must yield to the cars that have already crossed the line to enter the intersection/circle and will cross my direction of travel.
