Demarcation Signs
Demarcation signs are diamond shaped, divided vertically into red and white triangles. Each triangle is printed with the name of the area to which it points. Red triangles point to closed areas and white triangles point to approved or conditional areas.

Status Signs
Status signs are round red or white disks printed with the name of the area. The signs are inter-changed when conditions change, the white disk indicating, "open" and the red disk indicating, "closed."