text: I think part of the problem is that they're not all the same. This intersection for example has a "keep right" sign on Glenway (https://en.wikipedia.org/wiki/Road_signs_in_the_United_States#/media/File:MUTCD_R4-7.svg). So if you want to turn left onto Hillcrest you theoretically have to go around the circle. A majority of the other ones in town don't have that sign and you can make a straight left. Interestingly, OSRM routing has a way of distinguishing these "roundabout intersections" and give routing instructions accordingly ("turn left on Hillcrest" instead of "take the third exit to Hillcrest") https://github.com/Project-OSRM/osrm-backend/pull/2718