Abstract: The disclosures relates to a barrier plank for a roadway having spaced triangular section ridges extending across the plank at spaced locations along the length of the plank. Each ridge provides a facet facing at an acute angle to the plank in one direction and a corresponding facet on the other side of the ridge facing at an acute angle along the plank in the opposite direction. Facets have red retro-reflective surfaces and facets have white retro-reflective surfaces. Thus light directed from a vehicle at a shallow angle onto the barrier plank will be reflected back by the facets according to the direction of approach so the plank will be readily visible to the driver. Between the ridges the plank has alternate red and white reflective surfaces to reflect back light directed at normal or near normal angles to the plank.