A child suddenly runs out, chasing a dog. A large branch snaps in the high wind, dropping into your path. How do you respond ? With an "Emergency (or Controlled) Stop" :
1. Quickly. (So, anticipate what might happen ahead).
2. Safely. (Know how to avoid, and control, a skid).
3. Get going again promptly. (Move off as soon as it's safe).
Here's a short video illustrating the key points. See this one, too.