||<p>The red rating in the report prepared for the Office of Rail & Road (ORR) recognised
the lack of available effective options (at that time) for mitigating poor air quality.
Since then, Highways England have been undertaking an extensive programme of air quality
research, and have identified large barriers, overhanging part of the carriageway,
as a potentially effective measure.</p><p> </p><p>Highways England have also developed
an outline implementation programme. Drawing on the Air Quality Designated Fund, based
substantially on the provision of these barriers in specific locations.</p>