## 4 Results and Discussion
### Determination of BCI in Bridge No. 5  
This bridge is located at 12 th km of Semnan-Jandaq road (Figure 20) and has three spans, a length of twenty meters, a width of eight meters, and two lanes. Due to problems in the wall and foundation (Figures 21 and 22), the score of the structural index decreases to 83.635. Invasive agents caused erosion, and protection against them is weak. Safety equipment required major repair, lighting and brightness condition was in a bad status, and drainage condition could not provide the desired friction (look at Figure 23). Because of being in the same region and transport network, bridges No.4 and No. 5 have similar scores in the load impact index, geotechnical and seismic index, and strategic importance index. The mechanical facilities of the drainage system were improper. The volume of traffic was at a level of low. There are no proper traffic horizontal/vertical signs. The pavement had various distresses, and PCI was thirty-six. BCI in this bridge is calculated in Table 22. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & **Index** & \(\mathbf{W_{i}}\) & \(\mathbf{X_{i}}\) & \(\mathbf{W_{i}\times X_{i}}\) & **BCI = \(\sum\)(\(\mathbf{W_{i}\times X_{i}}\))** \\ \hline
1 & Structural & 0.331 & 86.355 & 27.683 & \\
2 & Hydrology and Climate & 0.097 & 52.75 & 5.117 & \\
4 & Bridge Performance (load impact) & 0.08 & 70 & 5.6 & \\
5 & Geotechnical and Seismic & 0.143 & 43.5 & 6.22 & \\
6 & Strategic Importance & 0.08 & 29 & 2.552 & \\
7 & Facilities & 0.046 & 30 & 1.38 & \\
8 & Traffic and Pavement & 0.068 & 45.67 & 3.106 & \\ \hline \hline \end{tabular}
\end{table} 
Table 21: BCI calculation of the bridge on 6 th km of Semnan-Jandaq road. Figure 19: Condition of pavement distresses in bridge NO. 4. Figure 21: Damage in the wall of the bridge No. 5. Figure 22: Bridge scour in bridge No. 5. In this section, the authors aimed to check the ability of their methodology. They selected five case studies from the bridge network in Semnan province, in Iran. The authors tried to adopt the bridges that have the maximum possible difference in condition. According to Tables 18-22, the bridge of 12 th km of Semnan-Jandaq road has the lowest BCI among the five studied bridges (BCI = 56.8). This bridge takes the highest priority for maintenance. The second priority is related to the bridge of 6 th km of Semnan-Jandaq road with BCI = 62.2. The bridge at the beginning of Shahmirzad road, with BCI = 72.8, takes the third priority. Two other bridges with BCI = 73.2 take the lowest maintenance priority. As mentioned in the earlier sections, a review of previous studies shows the lack of a comprehensive method for evaluating and prioritizing bridges. Each of the methods proposed by other researchers generally focuses on limited parts of the factors affecting the bridge conditions. In this study, the authors tried to develop a new methodology that includes all the factors affecting the condition of bridges. Scrutiny of the results obtained from five under-study bridges, with different characteristics, confirms that this method is feasible. On the one hand, the method is simple and can save time and money in the health monitoring process of the bridge network. On the other hand, the flexibility of the methodology is high, and therefore this methodology can be easily calibrated and implemented in any other place. It is enough to design the relevant questionnaire, gather the opinion of bridge experts, analyze the filled questionnaires, determine scores and weights, and after that, inspect and prioritize bridges. This study helps remove another gap: The lack of an efficient, comprehensive method/system for health monitoring of bridges in Iran. This gap results in wasting resources and time. Continuous, exact, complete health monitoring and correctly prioritizing are essential needs for infrastructures. The proposed methodology can simply apply in various regions of Iran. Therefore, this study helps improve the quality of BMS activities in Iran, and it can be another helpfulness of this work.