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Page 4 of the Rice Signs 2017 Traffic Safety Catalog explains how MUTCD traffic signs achieve night-time visibility through reflective sheeting. The page compares three ASTM-4956 sheeting grades — Engineer Grade (Type I) with roughly a 7-year service life, High Intensity Prismatic (HIP, Type IV) with about 10 years, and Ultra Prismatic or Diamond Grade (Type IX-XI) with up to 12 years — alongside their relative daytime brightness, nighttime brightness, and wide-angle reflectivity. Understanding these specifications helps you select the correct sheeting for highway, intersection, parking, or property applications.