# A Police and Insurance Joint Management System Based on High Precision BDS/GPS Positioning
## 5 Actual Accident Cases  
With the development of science and technology, there are a lot of schemes for rapid processing of traffic accidents on the market. Nevertheless, almost all of them can only obtain evidence after an accident. For example, the car owners have to get off the road and take photos to get evidence after an accident. The whole process of the accident can't be obtained. Hence, it is impossible for authorities and insurers to judge the authenticity of an accident. What's more, when car owners are involved in a disputed accident, it is still unavoidable to wait for the police and insurance personnel to arrive at the scene. The rapid processing scheme proposed in this article is based on high precision BDS/GPS positioning. It can obtain the whole process of an accident as evidence to judge the authenticity of the accident. It can also realize remote view of related accidents' cars in their accurate driving situation. The scheme has been verified on a large scale in Wuhan, Central China's Hubei Province, Ningbo, Eastern China's Zhejiang Province and other cities. The scheme is realized through a police and insurance joint management system which has put into use since April 2017. More than 30,000 terminals have been installed and put into use. A total of over 30 traffic accidents have been recorded on the remote platform. Two typical cases have been selected in order to describe how the system works to meet the requirements of traffic police and insurance companies to deal with an accident. Data upload  
When an accident occurs, firstly, the system obtains high precision trajectory data based on BDS positioning during the accident; secondly, the system automatically uploads videos taken during a period of 10 s before and after the accident happened; thirdly, the system conducts an intelligent driving behavior analysis of the owners, including driving information such as driving lane records, accurate rapid acceleration and rapid deceleration data, sharp turns, sudden lane changes; fourth, the car owner gets out, takes photos and uploads the data. The four sets of key data constitute a complete chain of evidence. This truly and accurately records the scene. 2. Remote view of the trajectory  
On the remote platform, the traffic police conduct a preliminary analysis of the driving behaviors and the accident situation by combining the high precision lane level map and the accident information. The trajectory data can be viewed on the remote platform. It is a traffic accident caused by a lane change, as shown in Figure 10.  
The base map is formed by overlaying the satellite map and the lane level e-map with decimeter accuracy. Then the trajectory data is matched with the base map. It is clear that the location of two cars overlays the crash point exactly. The red trajectory shows clearly the driving route of the white car. Therefore, the white car takes full responsibility for the accident as the red trajectory shows that the crash is caused by a lane change of the white car. Currently, the accuracy of the ordinary positioning equipment on the market is not sufficient. The relevant cars are far from each other on the platform when an accident happened, and they even may not appear in the same region. The effect can be seen in Figure 11 after matching the trajectory data obtained from an ordinary mobile phone with a Baidu map as shown in Figure 11. It is obvious that the crash points are not near to the cars due to the inaccurate positioning accuracy. It is impossible for traffic police to judge the authenticity and fault and liability of the accident if they didn't arrive at the scene. Figure 10: Reconstruction of the accident process. Evidence chain  
Certainly, the trajectory data is key evidence for the accident.