Delta is showing and demonstrating its range of retroreflectometer instruments, including the new RetroSign GRX, the company’ third-generation instrument for measuring retroreflection of road traffic signs, high visibility clothing, conspicuity tapes and number plates. RetroSign GRX can measure up to seven observation angles simultaneously, up to eight entrance angles using smart adapters, and offers many new features like automatic detection of sign colour, picture of sign, sign colour contrast, sign