Clipless pedals (safety release) Is there a safety feature in any brand of clipless pedals which allows the mechanism to release in the event of an accident? For example, being hit by a car in traffic while commuting, I would hope the bike wouldn't fly with me, but that I would somehow be released from the bicycle. I have only used clipless pedals in a spin class and I am hesitant to use them on the road for this reason. Does this feature exist?
In my humble experience with extensive crashing during mountain biking, including a lot of over-the-bar experiences and a few cases when I broke bones, before you hit the dirt, clipless pedals magically disengage themselves. In reality, being clipped is your least problem.

You really need to slowly stop the bike and then fall on a side to still remain being clipped in.

P.S. Just read the comments and discovered that it is not just me who observed magical disengagement of clipless pedals in the course of a crash.