ABSTRACT
This article uses the macroscopic fundamental diagram as a tool to study the traffic operation status of the road network. Using Chengdu's Didi trajectory data, a macroscopic fundamental diagram model of Chengdu's road network was constructed. This article divides the macroscopic fundamental diagram model curve into three segments. According to the position of the macroscopic fundamental diagram trend curve in each period, the operation state of each section of the road network in the trend curve is verified. Due to the huge amount of data, this article uses python programming language and Sql Server database to process traffic flow data to obtain and display the parameters required by the macroscopic fundamental diagram curve., According to the trend line of the macroscopic fundamental diagram and the position of the macroscopic fundamental diagram trend line graph at each time, analyzes the traffic operation status of the road network at each time period to find out place and the degree of congestion, and further analyze the traffic operation status to derive the relationship between each other. This further aids in providing timely and reliable traffic status information for traffic managers and traffic participants.
