600-178Section 630 — Permanent Raised Pavement Markers
630.1Description
1 Furnish and place permanent raised pavement markings according to the Contract documents and the Manual on Uniform Traffic Control Devices (MUTCD).
630.2Materials
630.2.1 General 1 Provide RPMs manufactured by either a potted or injection molded process that conforms to the provisions of this Subsection and complies with ASTM D4280. The RPM Drawings in the Plans are for illustrati on only and are not intended to specify any specific product.
630.2.2 Shape and Color 1 Provide RPMs with a 4 in. × 4 in. base, ⅝ in. in height , and 35- degree sloping sides (nominal dimensions). Ensure that the outer surface of the marker is smooth and that all corners and edges exposed to traffic are rounded. Provide RPMs of the color(s) indicated on the Plans and with either one or two reflective faces as r equired. When illuminated by automobile headlights, ensure that the reflective faces redirect light of the required color as specified herein. Ensure that the color of the reflectors when illuminated and when not illuminated is similar. The color of the RPM will be evaluated by the Department, and off -colors or non- similar color samples will constitute grounds for rejection.
630.2.3 Physical Requirements 1 Provide RPMs with a shell with a smooth exterior surface that contains one (mono- directional) or two (bi -directional) prismatic or micro- prismatic reflector faces, as specified in the Contract , molded to reflect incident light and having a minimum surface area of 2.50 sq in. Ensure that the minimum surface area of the base of the marker is 12 sq in. 2 Ensure that the markers have a hard, durable, abrasion resistant surface (untempered glass or a special abrasion resistant coating), bonded to the reflective face surface of the marker. The red lenses on the units with two colors are exempt from this requirement. 3 Ensure that the abrasion resistant surface of the reflector lens can withstand radial cracking, and shows only concentric cracks when damaged by impact of hard objects embedded in vehicle tires.