For years, the Dutch city of Maastricht had struggled with traffic jams. No longer. The Kaiser-Willem-Alexander tunnel is unique in Europe.
For the first time, one of Germany's famed motorways has been affected by a diesel ban. German cities have instituted or are bracing for bans on older diesel cars after violating European clean air laws for years.
Coping with traffic emissions in a city of 21 million is no easy task. Swapping four wheels for two is a good start, as the smoggy Chinese capital is learning for itself.
A study by MIT about self-driving cars as "moral machines" has triggered a hefty and controversial debate among journalists at DW's Science Department. Here are five contentious aspects — and what five authors think.
With at least 135,000 people killed annually in road accidents, India has more traffic fatalities than anywhere in the world. Without coherent regulations, this number is set to grow. Murali Krishnan reports.
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