由于车联网(VANET,vehicular Ad Hoc networks)的节点移动速度快、拓扑动态变化以及移动轨迹局限性等特性,多跳广播成为VANET中车间通信的有效方式之一。此外,由于直接在真实环境中评估VANET的性能是非常困难的,仿真成为研究VANET的有...由于车联网(VANET,vehicular Ad Hoc networks)的节点移动速度快、拓扑动态变化以及移动轨迹局限性等特性,多跳广播成为VANET中车间通信的有效方式之一。此外,由于直接在真实环境中评估VANET的性能是非常困难的,仿真成为研究VANET的有效工具。为此,先分析VANET的网络结构,再讨论了广播协议的发展现状,并分析了典型的广播协议。随后论述了VANET移动模型仿真的发展现状,并重点分析、对比了当前交通仿真器和网络仿真器的特点。最后,探讨了车载自组网仿真器未来的发展方向。展开更多
In this article, we study traffic flow in the presence of speed breaking structures. The speed breakers are typically used to reduce the local speed of vehicles near certain institutions such as schools and hospitals....In this article, we study traffic flow in the presence of speed breaking structures. The speed breakers are typically used to reduce the local speed of vehicles near certain institutions such as schools and hospitals. Through a cellular automata model we study the impact of such structures on giobal traffic characteristics. The simulation results indicate that the presence of speed breakers could reduce the global flow under moderate global densities. However, under low and high global density traffic regime the presence of speed breakers does not have an impact on the global flow. Further the speed limit enforced by the speed breaker creates a phase distinction. For a given global density and slowdown probability, as the speed limit enforced by the speed breaker increases, the traffic moves from the reduced flow phase to maximum flow phase. This underlines the importance of proper design of these structures to avoid undesired flow restrictions.展开更多
文摘由于车联网(VANET,vehicular Ad Hoc networks)的节点移动速度快、拓扑动态变化以及移动轨迹局限性等特性,多跳广播成为VANET中车间通信的有效方式之一。此外,由于直接在真实环境中评估VANET的性能是非常困难的,仿真成为研究VANET的有效工具。为此,先分析VANET的网络结构,再讨论了广播协议的发展现状,并分析了典型的广播协议。随后论述了VANET移动模型仿真的发展现状,并重点分析、对比了当前交通仿真器和网络仿真器的特点。最后,探讨了车载自组网仿真器未来的发展方向。
文摘In this article, we study traffic flow in the presence of speed breaking structures. The speed breakers are typically used to reduce the local speed of vehicles near certain institutions such as schools and hospitals. Through a cellular automata model we study the impact of such structures on giobal traffic characteristics. The simulation results indicate that the presence of speed breakers could reduce the global flow under moderate global densities. However, under low and high global density traffic regime the presence of speed breakers does not have an impact on the global flow. Further the speed limit enforced by the speed breaker creates a phase distinction. For a given global density and slowdown probability, as the speed limit enforced by the speed breaker increases, the traffic moves from the reduced flow phase to maximum flow phase. This underlines the importance of proper design of these structures to avoid undesired flow restrictions.
