This is how traffic lights can reduce pollution

So-called ‘intelligent traffic lights’ are a key opportunity to decrease air pollution. Photo: dpa

In his line of work, Frank Helbing can’t please everybody. The advisor at the main traffic office in the German city of Erfurt is responsible for deciding whether cars can sail through the city in a line of green or have to stop at frequent red lights, giving pedestrians the right of way.

“Anyone who thinks we can work magic is plain wrong,” he says.