A recent Kemrock development is a pultruded interlocking Sound Barrier, intended for use in built up areas where noise pollution is an ongoing problem. Manufactured as a hollow pulktruded profile, the panels can be filled with different media depending upon the degree to which noise absoption is required. Where partial visibility is required, combination installations using composites as the all important lower, noise absorbing area can be installed with polycarbonate upper panels providing the required transparency.