## 4 Results  
### Case Study  
The infrastructure accessibility of the Francia station is shown in Figure 4, where the layout of the metro station can be observed, including the platform, which features the ticket booth, turnstiles, and access to the passenger waiting area. Additionally, the width of the platform is considered, which includes a tactile paving zone, a yellow line, and, further along, the railing that marks the end of the platform. The platform length is 104 m at its longest section, which extends from the end of the platform to the access stairs. On the other hand, a length of 94 m is considered from the end of the platform to the accessible entrance for people with reduced mobility. The platform width is 3 m from the start of the tactile paving to the railing. The tactile paving has a width of 60 cm, resulting in an effective platform width of 2 m and 40 cm. On the side, the furniture (e.g., bins and benches) at Francia station has a width of 45 cm. Therefore, the effective platform width is 1 m and 95 cm, generating problems of accessibility. To identify the areas of highest congestion, data were collected on the platform for subsequent analysis. For this, the Francia station was visited on 5 weekdays. During these days, passenger behavior on the Francia platform was analyzed during the morning peak hour (MPH, from 7:00 a.m. to 9:00 a.m.) and the afternoon peak hour (APH, from 5:00 p.m. to 7:30 p.m.). The selection of measurement days was based on the methodology proposed by [11], where the variables to be measured are considered on a typical day of passenger flow. In this case, the morning peak hour was observed for 3 days, and then the afternoon peak hour was studied for 2 days. First, the metro station was visited, where data were collected from the study area through photos and videos, which were later analyzed using computer vision techniques to generate a result of the current situation at the Francia station platform. Next, an analysis of the study variables was conducted. Figure 4: Platform layout at Francia station in the Valparáso metro (94 m long by 3 m in width): (a) Left-hand side of the platform; (b) Right-hand side of the platform. There are several variables that are fundamental for analyzing the accessibility situation at the platform in Francia station. These variables play a crucial role in understanding the dynamics and operation of the station, as well as identifying potential areas for improvement. As shown in Figure 5, the number of passengers varied over time. A higher number of passengers was obtained at the APH, reaching a maximum of 98 passengers around 6 p.m.  
Table 1 presents the average number of passengers per segment at the platform, identifying that Segment 1 had the highest number of passengers both during the MPH and APH, with figures of 278 and 601 passengers per hour, respectively, in the study area. This number of passengers suggests that Segment 1 was the most crowded. This high traffic may be due to its proximity to the station's access door, and it requires special attention for proper operation. It is important to note that the total area of this study zone was 22.3 m\({}^{2}\), meaning this number of passengers circulated within a limited space, generating problems of accessibility. To analyze accessibility, a measurement of the physical elements of the Francia station platform was developed. For this purpose, the following table was completed, identifying whether it meets the accessibility standards (registered as \"yes\" or \"no\") based on \begin{table}
\begin{tabular}{c c c} \hline \hline
**Average Number of Passengers at the Platform [Passengers/h]** & \\ \hline
**Segment at the Platform** & **MPH** & **APH** \\ \hline Segment 1: Right-hand side of the platform & 278 & 601 \\ \hline Segment 2: Middle of the platform & 99 & 292 \\ \hline Segment 3: Left-hand side of the platform & 39 & 142 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: The distribution of passengers along the platform in Francia station during the MPH and APH time periods.