When a driver behind is overtaking or passing you, be alert for any unsafe actions by that driver, and:

• Increase your speed to challenge the overtaking driver.
• Maintain your current speed and ignore the overtaking driver.
• Reduce your speed slightly and make it easier for that driver to pass.
  Explanation:

  "When a driver behind you is overtaking your vehicle, remain alert for any unsafe actions by the other driver. It is courteous to slightly reduce your speed, facilitating a safer pass for the overtaking vehicle."
• Change lanes abruptly to block the overtaking driver.