## 5 Experimental Results and Analysis
### PTV Quantitative Evaluation Algorithm
#### 5.3.2 Modeling of PTV Hazard Rating
In the second case, compared to other types of vehicles, Class I passenger cars have a smaller volume and a lower level of danger. Calculate the corresponding membership degree. In the third case, Class II passenger cars refer to vehicles with 8 or more seats but less than 19 seats, Class III passenger cars refer to vehicles with 20 or more seats but less than 39 seats, Class IV passenger cars refer to vehicles with 40 or more seats, and the risk level of vehicles with 40 or more seats gradually increases. The corresponding membership degrees are calculated separately. In the fourth case, trucks and special operation vehicles have a relatively large weight and are prone to rollover. If a traffic accident is caused, the damage is generally more severe. Therefore, these two types of vehicles are considered equally dangerous and have a membership degree of 1. Formula (19): According to the limitations of reference traffic regulations, in the first case, when the driving time is less than or equal to 4 h, the membership degree is 0. In the second case, if the driving time is less than or equal to 4 h and less than or equal to 8 h, calculate the corresponding membership degree. In the third case, if the driving time is greater than 8 h and less than or equal to 10 h, calculate the corresponding membership degree. In the fourth case, when the driving time is greater than 10 h, the membership degree is 1. Formula (20): This is based on the analysis of characteristic indicators of section traffic flow, as well as previous researchers' analysis of the relationship between traffic flow and accident rate. In the first case, when the traffic flow is less than or equal to 750, the membership degree is 0. In the second case, when the traffic flow is greater than 750 and less than 1000, calculate the corresponding membership degree. In the third case, when the traffic flow is greater than 1000 and less than 1500, calculate the corresponding membership degree. In the fourth paragraph, when the traffic flow exceeds 1500, the membership degree is 1. Based on the measurement results of PTV indicators using various membership functions and corresponding weights, we use Formula (12) to calculate the comprehensive score of vehicles traveling on the road. To achieve this, we need to follow the AHP calculation criteria, compare the importance of each indicator in pairs, and construct a judgment matrix as shown below (Table 13):  
Among them, f1, f2, f3, and f4 represent OS, VT, LD, and VF, respectively. The elements in the matrix are obtained by experienced experts by pairwise comparison of their importance based on the scale table, which is the key to the analytic hierarchy process. After constructing the judgment matrix, it is necessary to perform consistency verification on the matrix according to Formula (10), and the verification result CR = 0.0679 \(<\) 0.1, which passes the consistency verification. The final calculated indicator weights are as follows:  
\[\omega=[0.506,\ 0.165,\ 0.214,\ 0.115]\]  
Among them, each value of \(\omega\) corresponds to the weight of PTV evaluation indicators f1, f2, f3, and f4. Through the operation of the AHP method, we will obtain the relative weights of each indicator, enabling accurate and reliable comprehensive evaluation of the PTV threat score. This comprehensive evaluation process will help to better understand and grasp the comprehensive threat level of PTVs and provide a scientific basis for relevant decision-making.