Abstract: High brightness durable retro-reflecting microspheres for retro-reflection and related uses (and a novel method of forming the same) is provided embodying a retro-reflective vitreous glass microsphere encapsulated in a hardened clear non-vitreous metal-oxide ceramic shell of substantially the same index of fraction as the microsphere.

Abstract: An improved roadway marker rubber-like strip in which the upper layer is deformed into protruberances such as wedges or ridges, preferably provided with a coating of exposed retro-reflective beads, that have been cross-link-vulcanized to provide the same with memory that permits shape restoration following depression by vehicle traffic, and a cold-flow un-vulcanized bottom layer adhered to the roadway and conforming without memory to the same under vehicle traffic.

Abstract: A flexible longitudinally extending roadway marker strip of flexible plastic rubber-like sheet material (produced by a preferred method of fabrication) comprises a cross-linked or vulcanized upper layer having longitudinally extending therealong successive sets of successively spaced protuberances, ridges or ridge segments deformed therein and extending transversely of the strip. Projecting retroreflective bead coatings are adhered to at least the forward and rearward surfaces of the protuberances, ridges or ridge segments, and flat unbeaded daylight-bright or colored-appearance segments are disposed intermediate the successive sets and have a dimension in the longitudinal direction of the strip greater than that of the individual projections, ridges or ridge segments and the spaces therebetween in each set.