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Abstract:Crack sealing is used in road maintenance but presents a problem when crack seal material visually pops out on the roadway, making it difficult to see lane stripes. This problem will increase as New Mexico increases its use of crack sealants. This survey has investigated whether there are any additives to the caulking material that will make it stand out less visually under certain conditions and what the impact of the additives are to the efficiency of the crack seal. The study was conducted in two different areas: modification of crack sealants and improvement of pavement markings. The Indiana Department of Transportation (INDOT), which has been crack sealing for many years, suggested an ASTM D-6690 mixture with 18 percent recycled tires. The routing and use of this material results in a high quality crack seal with very little degradation of the lane markings. The other avenue of research into alternative lane stripping materials and procedures has shown that thermoplastic tape has high levels of retroreflectivity and can lead to reduced crashes.
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