The lanes are not well thought out. Better to keep flowing as part of the traffic, in the center of a lane, with eyes and ears wide open as I navigate through the circle. In fact I do this in most circles - but hey, each to their own. Meanwhile: Thanks to DJR I went online and did a little research. Interesting little buggers these thorns! After using the lane, resulting in two punctures per wheel in 10 seconds I was understandably pissed off: I was convinced that an anti cycling third force had intentionally planted these - It seems to suggest however that they lay dormant until disturbed then spring into action. Leaves make a good surfactant; useful when finished fixing a flat caused by their thorns!!