Traffic lights and air quality

In No Idle Matter (2007), I wrote that the stop-start motion caused by traffic lights multiplies emissions and fuel use by a factor of four. In this piece, Prashant Kumar (University of Surrey) says air quality at signal-controlled junctions is no less than 29x worse than elsewhere. Our proposed solutions are different, but in both cases, traffic policy stands indicted.

About Martin Cassini

Campaign founder and video producer, pursuing traffic system reform to make roads safe, civilised and efficient
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