DG,

DnvrFox is right. There is more of chance of falling on a MUP than on an actual road. Both of my falls have been on MUPs when someone stopped in front of me quickly and for no apparent reason. On the road I am careful to unclip BOTH feet at the least sign of trouble or when approaching an intersection. One of the things I like about the Crank Bros Candy pedals is that I can just get my feet back up on the small platform and start pedaling. The shoes almost clip themselves in with the normal pedaling motion, usually before I'm across the intersection.