The study was undertaken using a soundlevel meter operated by a passenger in each car tested.
研究用这样的方式进行：每辆接受测试的汽车的乘客开启声音强度测试仪。
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The passenger took a series of between eight to 10 soundlevel measurements at various points in the journey from the position of the driver's left ear, at various speeds.
乘客带有八到十个声音强度测试仪，在旅途中放在距离驾驶员左耳不同的位置，在不同的车速下，进行测试。
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You can check the average soundlevel of the area around you, which might be handy if you're house-hunting or simply looking for a quiet spot to relax in.