What do these connected X’s markings on the road mean?

• They indicate areas where vehicles should increase speed.
• They mark the spots where trains will stop.
• They are decorative markings with no specific meaning.
• They visually highlight stopping distances to increase safety at railroad crossings.
  Explanation:

  "White roadway markings in the shape of connecting X’s found within dynamic envelopes are used to visually highlight stopping distances at railroad crossings to increase safety."