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,I <br />j, <br />G' <br />i <br />.4II <br />III <br />)I <br />u <br />H <br />G <br />characteristics. Ensure that the adhesive does not require a protective liner when the <br />removable tape is in rolled form for shipment. Ensure that the adhesive is capable of <br />temporarily bonding to the roadway pavement at temperatures of 50 °F [10 °C] and the <br />above without pick -up distortion by vehicular traffic. <br />990 -5.10 Color: Meet the requirements of 971-1.7. <br />990 -6 Work Zone Raised Pavement Markers. <br />Ensure that Work Zone Raised Pavement Markers (WZRPM's) meet the requirement <br />of 970 -1.2.1 and are certified as meeting the following except for Class E markers as <br />noted below: <br />(1) Composition: Use markers made of plastic, ceramic or other durable <br />materials. Markers with studs or mechanical attachments will not be allowed. <br />(2) Dimensions: Marker minimum and maximum surface dimensions is based <br />on an x and y axis where the y dimension is the axis parallel to the centerline and the x <br />axis is 90 degrees to y. Class E markers shall be 4 inch [100 mm] (W) by 2 inch [50 mm] <br />(H) by 1 inch [25 mm] (D). <br />The x and y dimension of Class D markers shall be a maximum of <br />5 inches [125 mm]. The x dimension shall be a minimum of 4 inches [100 mm] and the <br />minimum y dimension will be 2.25 inches [57 mm]. <br />Ensure that the maximum installed height of Class D markers is 1 inch <br />[25 mm]. Ensure that the maximum installed height of Class E markers is 2 inches <br />[50 mm]. Use Class D markers having a minimum reflective face surface of 0.35 in' <br />[225 mm']. Use Class E markers having a minimum reflective surface area of 1 in2 <br />[645 mm']. <br />Ensure that after installation, the marker's reflective face is <br />completely visible and above the pavement surface measured from a line even with the <br />pavement perpendicular to the face of the marker. <br />(3) Optical Performance: Ensure that the specific intensity of each white <br />reflecting surface at 0.2 degrees observation angle is at least the following when the <br />incident light is parallel to the base of the marker: <br />Horizontal Entrance Angle <br />Specific Intensity <br />0 degrees <br />3 <br />20 degrees <br />1.2 <br />For yellow reflectors, the specific intensity shall be 60% of the value <br />for white. <br />For red reflectors, the specific intensity shall be 25% of the value for <br />white. Reflectivity of all (WZRPM's) shall not be less than 0.2 Specific Intensity (SI) any <br />time after installation. <br />(4) Strength requirements: Markers shall support a load of 5,000 pounds <br />[20 kN1. Three markers per lot or shipment will be randomly selected for a test. <br />Position the marker base down between the flat parallel platens of a <br />compression testing machine. Place on top of the marker a flat piece of 65 durometer <br />rubber 6 by 6 by 0.375 inch [150 by 150 by 9.5 mm] centered on the marker. Apply the <br />compressive load through the rubber to the top of the marker at a rate of 0.2 in /s <br />[0.085 mm /s]. <br />QMarch 2007 01000 -206 03- 4122.D <br />