What action is recommended if the top of Lincoln's head is visible during the penny test for tire tread depth?

• Continue driving cautiously at a lower speed.
• Replace the tires promptly.
  Explanation:

  "

  A quick way to check your tire tread is to slide a penny into a tread groove. If you can see the top of Lincoln’s head, your tires are worn out. Therefore, they must be replaced as soon as possible.

  "
• Disregard the test results, considering it unreliable.
• Inflate the tires to the recommended pressure.