Why do motorists need to be alert and leave plenty of space around motorcycles?

• They tend to swerve unpredictably to avoid road hazards
• They tend to downshift or roll off the throttle to slow down thus not activating brake lights
• Wind gusts and drafts from a passing vehicle can affect a motorcycle
• All of the above
  Explanation:

  "Motorcycles may need to slow for road hazards like gravel, wet road or railroad crossings that don't affect cars the same way. Motorcyclists often reduce speed by downshifting or merely rolling off the throttle, which do not activate the brake light. So, be alert and leave plenty of space around motorcycles."