1. Material Type, Item 740.08
a. Type A90 is 90 mil (2.29 mm) thick.
b. Type A125 is 125 mil (3.18 mm) thick.
c. Type B90 is 90 mil (2.29 mm) thick.
d. Type B125 is 125 mil (3.18 mm) thick.
2. Glass beads, 740.09
a. Type A and B shall contain intermix beads throughout. Drop on glass beads are not required unless using a non-surface beaded markings.
3. Application of Heat-Fused Preformed Thermoplastic Pavement Marking, Item 647
a. Heat-Fused Preformed Thermoplastic Pavement Marking shall be applied only as auxiliary markings according to the manufacturer’s recommendations.
b. Apply primer sealer on portland cement concrete pavements if recommended by the manufacturer.
1. Same as 645
3. Use form CA-D-3A to document information
Refers to Item 641, Pavement Marking - General
Before the application of marking material, pavement surface should be clean and dry by using:
1. Power broom
2. Air jets (guns)
Approve the premarking for long lines and auxiliary markings to ensure proper layout placement.
Center lines shall be “T” marked to establish no-passing lines.
Example of Premarking
District shall provide center line paint logs.
As per Item 641.06 the Contractor shall establish references points to ensure proper placement of restored markings on projects where resurfacing or other operations will result in obliteration of the existing pavement markings.
Example of measurement of markings
Marking lines shall be applied to the width specified ± ¼ inch. (6 mm).
Pavement markings shall be free of uneven edges, overspray and other visible defects.
Example of uneven edge line placement
Pavement marking lines shall be placed as per SCD TC-73.10 as follows:
1. Edge lines shall be applied 6 inches (150 mm) from the pavement edge.
2. Lane lines shall be applied 2 inches (50 mm) to left of joint.
3. Center lines shall be applied 2 (50 mm) inches from joint.
Pavement marking lines shall be straight or smoothly curved true to the alignment of the pavement.
1. If deviation is greater than 3 inches (75 mm) in 100 feet (30 meter), it shall be corrected.
Gaps shall be filled that were not marked as a result of template use for spray-applied auxiliary markings with marking material after the template is removed.
1. For extruded thermoplastics gaps may be left.
Example of retroreflectivity check
Pavement marking lines shall be sharp, well defined and uniformly retroreflective.
1. To check for retroreflectivity put sun over shoulder.
2. If it is not sunny:
a. A well beaded line in the daylight will appear dull.
b. While an unbeaded line will be shiny.
3. Review lines at night for retroreflectivity if possible.