May I be the first to congratulate the Highways Agency and Luton Borough Council for waking up to the fact that lower speed limits can help cut pollution levels on motorways. And just a mere 14 years after Stephen Plowden and Mayer Hillman provided solid evidence for this in their excellent book Speed Control and Transport Policy (Policy Studies Institute 1996).
Not only do cars travelling at 50mph emit less pollution than at 70mph; lower speeds also make rail more competitive on journey...
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