M 41-10 Page 9-125 Raised Pavement Markers (RPM) 9-219-21 Raised Pavement Markers (RPM)
9-21.1 Raised Pavement Markers Type 1
9-21.1(1) Physical and Chemical Properties
The markers shall be of uniform composition and free from surface irregularities, cracks, checks, chipping, peeling, spalling, crazing, and other physical damage interfering with appearance, application, or durability. The markers shall be precast in the form of a single based spheroidal segment terminating in a rounded or squared shoulder. Markers shall be white or yellow. The markers shall meet the following requirements: Property UnitThermoplastic Markers Plastic Markers Mass grams N/A 125 min. Height inches 0.65-0.78 0.65-0.78 Diameter/Width inches 3.85-4.05 3.85-4.05 Shoulder height inches 0.08-0.22 0.08-0.22 Planeness of base: Concavity inches 0.05 max. 0.05 max. Convexity inches 0.05 max. 0.05 max. Reflectance (white only) %MgO 80 min. 80 min. Impact resistance inch-pound 15 min. 15 min. Titanium Dioxide (white only) % by weight N/A 21 min. The markers passing laboratory tests will be field tested for approval. The field tests will include installation with control markers to determine relative adhesion and durability characteristics.
9-21.2 Raised Pavement Markers Type 2
9-21.2(1) Standard Raised Pavement Markers Type 2
The marker housing shall contain reflective faces as shown in the Plans to reflect incident light from either a single or opposite directions and meet the requirements of ASTM D 4280 including Flexural strength requirements.
9-21.2(2) Abrasion Resistant Raised Pavement Markers Type 2
Abrasion Resistant Raised Markers Type 2 shall comply with Section 9-21.2(1) and meet the requirements of ASTM D 4280 with the following additional requirement: The coefficient of luminous intensity of the markers shall be measured after subjecting the entire lens surface to the test described in ASTM D 4280 Section 9.5 using a sand drop apparatus. After the exposure described above, retroreflected values shall not be less than 0.5 times a nominal unblemished sample. Page 9-126 M 41-10
9-21 Raised Pavement Markers (RPM)9-21.3 Raised Pavement Markers Type 3
Raised pavement markers Type 3 shall be extruded from high impact thermoplastic material which has been ultra-violet radiation stabilized and shall meet the following requirements: Impact resistance 15 inch-lbs, min. Reflectance (White Only) 80 percent min. Concavity & Convexity Transverse ¹/16 inch, max. Longitudinal ⅛ inch, max Base Width 4″ Length 6″, 8″, 10″ or 12″ Height 0.60-0.75″ Shoulder height 0.08-0.20 The ends shall be beveled from the top of the shoulder edge at a slope of 1:1 nominal.
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