What do the connected X markings on the road mean?

• They indicate a pedestrian crossing area.
• They highlight stopping distances to increase safety at railroad crossings.
  Explanation:

  "The connected X markings are used at railroad crossings to visually indicate the distance where vehicles should stop. These markings help ensure that drivers stop far enough from the tracks to safely see oncoming trains."
• They show where vehicles must stop for a red light.
• They are warning signs for an upcoming intersection.