Motorways may be covered by ‘tunnels’ in bid to cut pollution

‘Large “tunnels” covering stretches of motorway to protect locals from dangerous levels of pollution are being considered by Highways England.
The agency said in its latest air quality strategy that it is exploring the possibility of building physical canopies around main roads to soak up car fumes.
In its report, Highways England says it is “investigating if we can reduce the costs to construct a canopy, which is a tunnel-like structure designed to prevent vehicle emissions reaching our neighbours”.
After trialling a similar physical barrier to pollution in 2015, which initially stood at four metres high and stretched 100 metres down the M62, the agency said it is now running tests on a material that can clean the air.
If this trial proves successful, the agency said it would consider implementing such barriers across its network of motorways and trunk roads.’
Read more: Motorways may be covered by ‘tunnels’ in bid to cut pollution