Policymakers also should be talking about how self-driving vehicles can help reduce traffic jams, cut emissions and offer more convenient mobility options.

政策制定者还应该讨论自动驾驶汽车如何帮助减少交通堵塞、减少排放，并提供更方便的出行选择。

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To increase awareness of traffic laws and regulations to reduce artificial traffic jams, through all sectors of society to work together to create a good traffic environment.

要加大交通法规宣传，减少人为的交通拥堵，通过社会各方面的共同努力，共创良好的交通环境。

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"Since the 'Car Free Day' is meant to reduce pollution and traffic jams, all drivers should support this," said Li Ming, a taxi driver in Beijing.

北京出租车司机李明说，“‘无车日’意味着减少污染和交通堵塞，所有司机都应积极响应。”

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Middle-class Algerians bought so many imported Renault, Peugeot and Hyundai cars that the government slapped on a sales tax to reduce traffic jams.

ECONOMIST: Why Algeria is still dull and gloomy

Singapore has also deployed GPS technology to reduce traffic jams, a tactic that Naveen Lamba, an transportation analyst with IBM, has proposed we adopt for our clogged roadways here.

FORBES: Can GPS Solve Our Traffic Woes?

But there's only one sure-fire way to reduce air traffic jams: put fewer planes in the sky.

FORBES: Fuel Costs Could Trim Summer Air Travel. A Bit.