Retroreflective pavement marker

A raised retroreflective pavement marker (10) that provides both improved retroreflectivity and longer life has a rigid opaque, synthetic resin body (12) having at its front face septa (14) to which a plastic cube-corner reflector (18) has been bonded to provide a plurality of hermetically sealed cells (16) beneath the reflector. This pavement marker differs from those on the market in that the thickness of its reflector is less than 2 mm, and it has preferably at least 500 cube-corner elements per cm².