A simple sign kit for mounting on top of a barrier post that has only two sheets of flexible material: a mounting part having a first sheet and a sign member having a second sheet. The mounting part has a first edge extending from a first end to a second end of the mounting part; a second edge extending from the first end to the second end; end engaging means adjacent the first end and end engaging means adjacent the second end for engaging the first end with the second end; first sign engaging means adjacent the first edge; second sign engaging means adjacent the first edge; and one or more apertures formed in the mounting part to allow members extending horizontally from an upper end of a barrier post to extend therethrough when the mounting part is mounted on top of a barrier post.