网上调查，现在的首选方法，因为他们是最划算，有效率的生产数据的快速，专家说。
Online surveys are now the preferred method because they are the most cost-effective, efficient means of producing data quickly, experts say.
车辆行驶状况路上调查采用分时段交错法进行，并使用具有高精度的可跟踪滤波的非接触式速度传感器等先进设备采集数据。
Vehicle real driving investigation comes up with time section cross method, and USES advanced instruments such as non-contacted speed sensor with tracking filter etc.
免费网上调查、数据库可笑预言。
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