Why should you keep extra space and be alert when riding behind motorcyclists?

• Because they tend to suddenly stop without warning
• Because they often slow down using hand signals
• Because they accelerate more quickly
• Because they often slow down by downshifting or easing off the throttle, which does not activate the brake light
  Explanation:

  "You must maintain additional space in between and exercise caution when following motorcyclists as they may reduce speed by downshifting or easing off the throttle without activating the brake light."