中文摘要：

针对绿灯信号倒计时与其他道路交通因素对交通运行的综合作用问题,选择6处道路交叉口为调查地点,使用雷达测速设备采集进口道自由流车速及车辆通过的时间点,同时标记超速数据。运用描述统计及假设检验、方差分析、列联表等推断统计方法分析速度均值、离散度、超速率等数据与绿灯信号倒计时等因素之间的关系。结果发现：是否安装交通违法检测设备对车速均值具有显著影响,而绿灯信号倒计时则没有显著影响;在绿灯信号倒计时且无交通违法检测设备的情况下,车辆速度均值会更高;绿灯倒计时会对超速比例产生影响。研究结果表明,单独使用绿灯信号倒计时会对交通安全产生不利影响,应同时安装交通违法检测设备,会使车速与超速率得到有效控制。

英文摘要：

According to the synergic effects of green signal countdown and other factors on traffic situation, six road intersections were chosen for investigation, and radar measuring device was employed to collect speed data with time points and over speed data at intersection approaching. Descriptive statistics, hypothesis testing, analysis of variance and contingency table methods were applied to analyze the relationship between mean speeds, dispersion, over-speeding rate and green signal countdown device. The results show that not the green signal countdown device but the installation of traffic contravention detection has a significant impact on the mean speed. The drivers prefer to higher speed in the condition that has green signal countdown device and no traf- fic contravention detection. The green signal countdown device will affect the rate of vehicles with over speed greatly. These results indicate that only using green signal countdown device have adversely affect on traffic safety, but mean speed and over speed rate can be held in the case of both green signal countdown device and traffic contravention detection are used at the same time. 8 tabs, 4 figs, 15 refs.