If any part of Abraham Lincoln's head is covered by the tread during the penny test, what does it mean?

• The tread is excessively worn.
• The tires are overinflated.
• The tread is within the safe limit.
  Explanation:

  "When doing the penny test, if any part of Lincoln's head is covered by the tread, you're driving with the legal and safe amount of tread. If your tread gets below that (approximately 2/32 of an inch), your car's traction on the road, especially in poor conditions, is significantly compromised."
• The tires need immediate replacement.