Originally Posted by Proximo

Frankly, SPD are much better pedals for stop-and-go traffic than any of the road bike pedals. For one, you can clip in on either side and, two, the typical MTB shoes used with SPD pedals have lugged rubber soles that grip the pedal even if you miss the clip-in. If you miss the clip-in on SPD-SL, the slick hard sole shoes slip right off.