Impacts of Traffic Management Measures on Urban Network Microscopic Fundamental Diagram

The macroscopic fundamental diagram(MFD) exists in large urban networks where traffic conditions are homogenous.It can be used to estimate the level of service on road networks,conduct perimeter control,and model macroscopic traffic.Different network conditions exert different effects on the shape of the MFD.The factors that influence the MFD shape should be identified,which is the premise of understanding the urban traffic laws based on the MFD.The paper takes Haizhu District network of Guangzhou,China for the analysis using Paramics.A microscopic simulation is conducted to derive MFDs under different management conditions.Results indicate that the MFD shape is a property not only of the network itself but also of the applied traffic control measures,which is able to reflect the police effects.Meanwhile,the dramatic changes in traffic demand,the setting of bus lane,and the lane forbidden all have certain impacts on the MFD shape.Additionally,the critical sections should be given priority when developing the traffic control strategy.