Ah, now I understand. You really didn't lay it down. Circumstances pulled the road out from under you. Yeah it can happen to anyone at any time. That is why I always stress riding gear and such. Glad you had on your riding gear or there might have been more than bruises and aches.
If my thinking is correct the little barrier is more of a raised marker on the road surface between lanes. That is all it would take to bring you down under the right circumstances. Thankfully you could walk away from the mishap and plan to ride again as soon as possible.
