研究成果可为城市道路交叉口的规划、设计、管理提供定量依据。
The results have objective meaning on rational assessing and optimizing designing of urban road intersection.
本研究是采取随机、双盲、交叉试验设计。
This study was designed as randomized, double-blind and crossover trials.
这个研究试验采用了交叉设计，这样每一个研究对象的对照组就是他（她）自己。
The study used a "cross-over" design, which allowed each subject to serve as his or her own comparison group.
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