As an economical and effective method, the expressway noise barrier is a primary measure to reduce traffic noise.

高速公路隔声屏障作为一种经济有效的方法，是降低交通噪声的主要措施。

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Noise barrier is a kind of effective and economical method to reduce traffic noise.

声屏障是降低交通噪声等流动性声源的一种有效而经济的方法。

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As an economical and effective method, expressway noise barrier is a primary measure used to reduce traffic noise.

作为一种经济而有效的手段，声屏障是控制和降低高速路交通噪声的主要措施。

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He said the airport would continue to work with airlines, traffic control company Nats, policy makers and residents to reduce noise further while "safeguarding the vital connectivity and economic growth that Heathrow provides".

BBC: Heathrow to rank airlines on noise pollution