中文摘要：

车流量检测是智能交通监控系统的重要组成部分.提出一种基于灰度阈值的车流量检测算法,利用该算法对一条三车道道路上同一横断面相邻车道发生交通事故时,另一条未发生交通事故车道的车流量进行了统计,并对不同的未发生交通事故车道（内车道和外车道）的车流量的差异进行了t检验.结果表明,利用该算法统计的车道的车流量准确率达95%以上,说明该算法是可行有效的;当相邻车道发生交通事故时,不同的未发生交通事故车道（内车道和外车道）的通行能力有显著差异.

英文摘要：

Traffic flow detection is an important part in Intelligent Traffic Control System. A traffic flow detection algorithm based on gray threshold is presented in this paper. When a traffic accident occurs on the neighboring lanes of the same cross section in a three lane road, the traffic flow on the other lane（inside lane or outside lane） where no traffic accident occurred is detected by using this algorithm. And the difference between the traffic flow in inside lane and in outside lane is tested by t test. The results show that the accuracy of traffic flow is more than 95% when using this algorithm, which indicates that this algorithm is feasible and effective. When a traffic accident occurs on the neighboring lanes, the difference between the traffic flow in inside lane and in outside lane is significant.