The purpose of the Centerline Rumble Strips sign is to inform drivers that centerline rumble strips have been installed along the upcoming highway section. MTO Book Location: New, Not in Book Reflective Engineering GradeHi-IntensityDiamond Grade Substrate AluminumGalvanized Steel Size 120cm x 120cm (48" x 48")90cm x 90cm (36" x 36") Quantity Add to Quote