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Retroreflection is the phenomenon of light rays striking a surface and being redirected directly back to the source of light. A retroreflectometer shines a light at a pavement marking (simulating a vehicle’s headlights) and measures the amount of light returning to the driver’s eyes.
Retroreflectivity testing ensures that new pavement markings meet minimum initial retroreflectivity and determines if existing pavement markings are meeting minimum standards or should be replaced.
ARA is equipped to perform a full range of retroreflectivity testing services, including:
- Developing sample units in accordance with ASTM D 6359-99
- Performing dry retroreflectivity testing in accordance with ASTM E 1710-05
- Performing wet retroreflectivity testing in accordance with ASTM E 2177-01
- Providing quality assurance monitoring during marking installation, including:
- Minimum retroreflectivity
- Correct wet film thickness
- Correct optic application rate
- Proper tape placement procedures
- Measuring groove depth for recessed striping
- Monitoring ambient temperature and relative humidity
- Performing spectrophotometry testing in accordance with ASTM E 1349-90 and ASTM D 6628-03
ARA is performing on-going retroreflectivity studies on 2 pavement marking test sections for the Illinois Tollway, one of which has 12 marking types (epoxies, polyureas, urethane, hybridized polymer, and tapes) placed on a 3-mile section of an 8-lane interstate and on 6 ramps.
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ARA’s Retroreflectometer – the Delta LTL-X
Liquid Marking Application with Double Drop of Optics
Polyurea with Retroreflective Optics
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