Patent ID: 8757596

Claim:
A guard rail having noise-reducing measures comprising: a plurality of substantially vertical posts ( 3 ); a longitudinal guard rail beam ( 2 ) supported by the plurality of substantially vertical post through arms attached to the posts; and a noise-absorbing plate ( 1 ) attached to and longitudinally extending between each adjacent pair of the plurality of substantially vertical posts ( 3 ) at a rear of the longitudinal guard rail beam and extending substantially the entire height of the vertical posts, the noise-absorbing plate comprising a core of noise-absorbing material, wherein the longitudinal guard rail beam ( 2 ) comprises perforations and sound passes through the perforations into the noise-absorbing plate ( 1 ), and wherein the noise-reducing measures further comprises a top plate ( 4 ) extending substantially the entire length of the longitudinal guard rail beam from the longitudinal guard rail beam to the noise-absorbing plate ( 1 ), the top plate being coupled to the longitudinal guard rail beam and the vertical posts, and extending above and covering the arms, the posts and the noise-absorbing plate, and wherein the top plate ( 4 ) is provided with perforations in the form of punched long perforations so that the top plate ( 4 ) substantially has the characteristics of a grating and sound passes through the perforations into the noise-absorbing plate.