Why should drivers be cautious when observing a flashing turn signal on a motorcycle?

• Because motorcycle signals are not bright enough to be visible
• Because motorcycle signals may not be self-canceling, and riders may forget to turn them off
  Explanation:

  "Don't be fooled by a flashing turn signal on a motorcycle as motorcycle signals may not be self-canceling and motorcyclists sometimes forget to turn them off. Wait to be sure the rider is going to turn before you proceed."
• Because motorcyclists intentionally leave signals flashing to confuse traffic
• None of the above