Patent ID: 6976803

Claim:
A stationary board adapted to be set up in a medial strip between traffic lanes to block lights of oncoming vehicles in said medial strip and facilitate identification of said medial strip in nighttime driving or riding, said stationary board comprising a pair of plate members each composed of a molded component made of a transparent plastic material, said plate members being coupled with one another at the respective marginal edges thereof to form an integrated assembly having a hollow space therein, wherein each of said plate members is formed with irregularities in its inner surface facing said hollow space of said assembly, and at least the marginal region of said inner surface has a coat layer of a luminous material thereon; wherein each of said plate members has a central region and a peripheral region on the outside of said central region, said central region having a flat shape, the inner surface of said central region being formed as a rough surface with fine irregularities, said peripheral region having an arc shape in horizontal section, the inner surface of said peripheral region being formed with a number of pyramid-shaped protrusions in its entirely.