中文摘要：

阐释城市道路单点信号控制交叉口存在的问题及其改善措施.选取福州市马尾区罗星西路与青州路十字信号控制交叉口，调查分析该交叉口原配时方案，发现该交叉口存在早、晚高峰现象，且信号配时不优.运用Synchro软件进行交通配时优化，得出信号配时方案，再运用Vissim软件进行仿真，优化后该交叉口各个进口道的平均排队长度和延误时间均降低.将信号管制下交叉口范围内的碳排放作为评价指标进行分析，该交叉口信号配时优化后早、晚高峰碳排放量分别降低21.47％和18.06％.

英文摘要：

Intersection at Fuzhou Luoxing West Road and Qingzhou Road was used as example to study signal control at urban single point intersection and solutions. Investigation showed that vehicle peaked at the intersection in the morning and evening, but lacking in effective signal timing control. Therefore, an optimized signal timing scheme was put forward by Synchro software and followed by being stimulated by Vissim software to calculate average queue length and delay of each approach after optimization. As a result, carbon emissions were reduced by 21.47% and 18.06% in the morning and evening peaks, respectively, after optimization.