Clipless pedals have more to do with efficiency than anything else. Nearly all of your effort goes into the pedals and, assuming you have been fitted correctly, your feet stay in the most favorable position with respect to the foot/pedal interface.

I think people fall with clipless for 2 reasons:

> Not anticipating that they might have to stop or slow down enough that balance becomes an issue.
> A moment of indecision regarding which foot to unclip.

For the first, be conservative. If you unclip 30% more than needed, so what? Better to unclip too many times than not enough. If you need to continue pedalling slowly, position the arch of your free foot over the pedal. That way you can put some force into the pedal and not worry about clipping in by mistake.

For the second, I consistently unclip my left foot. I now do this instinctively. Often by the time you think Left, NO Right it's too late.

The only saving grace about this is that usually you are all but stationary when all this happens. But, the pavement is still HARD!!