基于时间安全余量的跟驰模型.pdfVIP

第30 卷 第6 期 长安大学学报( 自然科学版) V l. 30 N . 6 2010 年11 月 J urnal f Changan University( Natural Science Editi n) N v. 20 10 : 2010) 肖永剑, 冉启武, 杨建国 ( , 710049) : 为了能够找到CA 跟驰 型无法对道路的通行能力进行准确分析的原因, 并对之进行改 进, 分别从时间安全余量和空间安全余量的角度对CA 跟驰 型进行了分析结果表明: 由于传统 CA 型的跟驰间距是在临界跟驰间距的基础上添加一个空间安全余量, 因此在车辆低速时, CA 型推出的跟驰间距会大于现实数据, 而在车辆高速时, CA 型推出的跟驰间距又会小于现实数 据, 从而导致CA 型在分析交通通行能力时不准确; 而将 型的安全余量加在时间上, 则可以在 车辆中低速条件下有效地克服传统CA 型的不足之处, 其仿真数据与实地采集的数据, 在车流 速度不超过60 km/ h 时有较好的吻合度 : 交通工程; 跟驰 型; 微观仿真; 安全余量; CA 型; 交通流量 : U 491 : A New car following model based on time safety margin XIAO Y ngjian, RAN Qiw u, YA NG Jiangu ( Sch l f Electrical Engineering , Xi an Jia t ng University , Xi an 710049, Shaanx i, China) Abstract: In rder t find ut the reas n w hy CA ( c llisi n av idance) car f ll w ing m del can n t be applied t analyze the tr affic capacity accurately and the w ay t m dify this m del, CA m del w as the retically analyzed fr m the perspective f distance safety margin and time safety margin respectively. T he result indicates that as the c nventi nal CA m del applied its safety margin n distance, the f ll w ing interval derived fr m c nventi nal CA m del w uld be smaller than field data under the c nditi n f l w speed, w hile it w uld be larger than field data under the c nditi n f high speed, and it made CA m del can n t be applied t analyze traffic capacity accu r ately. T apply the safety margin n time can verc me the sh rtc ming f c nventi nal CA m del under the c nditi n f l w and medium speed, and the simulati n data matches the field da ta w ell w hen the speed f tra