They incorporate the reflective properties (n-I), to the signs.
Models: Stripes of yellow and black - 45º AC 178.5, 50 mm 5 5 m. - 178E AC, 50 mm x 45.7 m - AC 178.10, 100 mm x 5 m. - AC 178. 10E, 100 mm x 45.7 m 45 ° red and white stripes - AC 180.5, 500 mm x 5 m. - 180E AC, 50 mm x 45.7 m - AC 180.10, 100 mm x 5 m. - AC 180. 10E100 mm x 45.7 m.