连续交通流特性信息加权线性多步扩展法研究

Research on weighted linear multi step expansion method about uninterrupted traffic characteristics information

利用交通流速度—密度的格林希尔茨线性关系，对观测数据进行加权线性多步扩展，然后再通过误差调整得到了近似且完整的交通流特性曲线，并利用国外的实测数据对该扩展法可行性进行了验证。最后，对三条路的观测数据运用该扩展法得到了三条交通流特性曲线，以供应用参考，文中讨论的加权最小二乘法可用于交通预测。

By the use of traffic stream speed density relationship curve of Greenshields,we expand the data in weighted linear multi step exapnsion.Then,through error adjustment,we get a very similar and integrated traffic stream characteristics curve.The feasibility of expansion method has been checked by field data abroad.In the end,it is used to draw three traffic stream characteristics curves out of observed data of three highways,which can be referred to.The weighted method of least spuares linear can also be used in traffic volume prediction.