Portable sign and barricade assemblies and plastic molded uprights and light and flag mounts therefor

In combination, an upright and a base support for supporting said upright in a generally upright position, said upright having a non-cylindrical shaped lower end portion, and said base support having a correspondingly shaped non-cylindrical mounting hole for close sliding receipt of said lower end portion of said upright in said mounting hole, said mounting hole having multiple sides, each of said sides having a plurality of laterally spaced, longitudinally extending ribs around the entire periphery of said mounting hole that are transversely rounded in a direction normal to an axial length of the ribs for establishing axial line contact with said lower end portion of said upright when inserted into said mounting hole, and a combination light and flag mount having a lower end attachable to an upper end of said upright, said combination light and flag mount comprising a hollow molded plastic body member having front and back walls and opposite side walls, and an inwardly stepped upper end having a transversely inwardly extending surface for supporting a light thereon and an axially outwardly extending surface having a hole extending therethrough for receipt of a fastener for attaching the light to said stepped upper end, and at least one flag mounting hole extending at least partway through said body member at a downwardly extending angle between said side walls below said stepped upper end of said body member.