Red and white markers are typically seen approaching concealed level crossings, such as railroad crossings that are hidden beyond bends or other obstructions. These markers act as countdown signs warning drivers that they are nearing a level crossing they might not be able to see right away. They are used to alert drivers to potential hazards ahead, allowing them to slow down and be prepared to stop if necessary. These red and white markers are found in locations such as rural roads, highways, and even urban crossings where level crossings may be concealed from direct view. The markers are usually in the form of posts or painted road markings and serve as a clear visual warning for drivers to exercise caution near these concealed hazards.

In summary:

• Seen near concealed level crossings, especially where visibility is restricted.
• Act as early warning signs indicating drivers should be prepared to stop.
• Found on various types of roads including highways, rural, and urban areas.
• Markers are red and white striped posts or painted road markings.

This is the primary purpose and location where these red and white markers are used.