This paper reports a study concerning occurrence and growth of traffic jam in a harbor tunnel.The single-lane with three sections(downgrade,flat,and upgrade) is taken into account and they are characterized with diffe...This paper reports a study concerning occurrence and growth of traffic jam in a harbor tunnel.The single-lane with three sections(downgrade,flat,and upgrade) is taken into account and they are characterized with different velocity limit.At the low density,the traffic current increases linearly with density and saturates at some values of immediately density.As the density increases,the traffic jam appears firstly before the upgrade section and then extends to the downgrade section.Additionally,the relationships of the velocity and headway against position in different densities are obtained from simulation.These results clearly clarify where and when the traffic jam appears. Finally,the critical densities are derived via the theoretical analysis before and after the discontinuous fronts and the theoretical results are consistent with the critical values of simulation results.展开更多
基金Supported by Research Grants from City University of Hong Kong,HKSAR under Grant No.CityU-SRG 7002684Science&Technology Program of Shanghai Maritime University under Grant No.20110046+1 种基金Shanghai Municipal Natural Science Foundation under Grant No.10190502500National Natural Science Foundation of China under Grant Nos.11172164,71101088 and 71171129
文摘This paper reports a study concerning occurrence and growth of traffic jam in a harbor tunnel.The single-lane with three sections(downgrade,flat,and upgrade) is taken into account and they are characterized with different velocity limit.At the low density,the traffic current increases linearly with density and saturates at some values of immediately density.As the density increases,the traffic jam appears firstly before the upgrade section and then extends to the downgrade section.Additionally,the relationships of the velocity and headway against position in different densities are obtained from simulation.These results clearly clarify where and when the traffic jam appears. Finally,the critical densities are derived via the theoretical analysis before and after the discontinuous fronts and the theoretical results are consistent with the critical values of simulation results.
