Different from the current road traffic noise measurement time of 20 min, 5 min measurement results was got and compared to 20 min results. It can be concluded in a certain condition, there were no significant differences of the average equivalent sound level between two time length measurements.%目前道路交通噪声的监测时间规定为20 min，监测工作量大。实验采用5 min测量与20 min测量进行比较，结果表明，2种时间测量的最终结果无明显差异。
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