Abstract: A light reflecting delineator particularly adapted for delineating or marking the edges of road shoulders, bridges, abutments or other areas or objects that should be marked for the safety of motorists. The delineators are preferably of the reflex reflector type and are formed with a relatively small radius arcuate configuration in at least one plane which greatly improves their performance. Thus, the delineators reflect the light of an approaching vehicle over a far greater angular distance than do the conventional flat faced delineators in common use. The arcuate configuration of the delineators may take the form of a portion of a sphere, or a cylinder or a portion thereof.