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<p>Highways England have been undertaking extensive research into potential air quality
solutions for the strategic road network that could reduce levels of NO2. They have
explored a wide range of ideas including the effectiveness of different traffic management
options, understanding obstacles to greater use of electric vans on the network and
different types of barrier design.</p><p> </p><p>Based on all their research, they
have robust evidence that a 9.5 metre high barrier can help reduce levels of nitrogen
dioxide behind the barrier and have developed a programme to identify potential sites
around the network.</p>
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