学院学术讲座（2014-10-24）-博彩导航站-博彩导航

Abstract: Up to now, the evolution principle of traffic flow has not yet been well understood and the controversies in traffic flow theory are very heated. The controversies are mainly due to, as realized by the traffic community, a lack of precise traffic data. Motivated by the fact, we have carried out an experimental study in a simple scenario of car-following platoon (comprising of 25 passenger cars) on a 3.2-km-long open road section.
The experiment found that the standard deviation of the car velocities increases linearly when the leading car moves slowly and concavely when the leading car velocity increases. We also found when the velocity difference between the car and its preceding one is always small, the headway could change significantly. We propose two possible reasons for the feature. (i) In certain range of headway, drivers are not so sensitive to the changes in headway when the velocity differences between cars are small. Only when the headway is too large (small), will they accelerate (decelerate) to decrease (increase) the headway. (ii) At a given velocity, drivers do not have a fixed preferred headway. Instead they change their preferred headway either intentionally or unintentionally from time to time in the driving process.

We have simulated the traffic flow in a platoon with the well known optimal velocity model (Bando et al., 1995) and the intelligent driver model (Treiber et al., 2000). The simulation results are significantly different from the experimental ones. In particular, the standard deviation of the car velocities increases convexly, which is qualitatively different from that in the experiment.
We have proposed two different types of car-following models based on the two mechanisms mentioned above, respectively. It is shown that the simulation results are in agreement with the experimental ones.

姜锐，中国科学技术大学教授，博士生导师。于1998年和2003年在中国科学技术大学获得学士和博士学位，主要从事交通流理论、模型和其它相关复杂系统的研究。负责或作为研究骨干参加和完成多项国家自然科学基金面上和重点项目以及973项目的研究。博士论文被评为2005年全国百篇优秀博士论文，2006年入选教育部新世纪优秀人才支持计划，2005-2006获得德国洪堡基金资助，2008-2009获得日本学术振兴会资助，2014年获得国家自然科学基金优秀青年基金资助。发表SCI论文100余篇，刊登在Transportation Research Part B, Physical Review Letters, Physical Review E, Scientific Reports, PLOS One等刊物上，论文被他引1400余次。出版1部专著“现代交通流理论及其应用”(清华大学出版社)。曾获安徽省自然科学优秀论文一等奖，安徽省科技奖(自然科学类)二等奖。