## 5 Conclusions  
This research sought to analyze the effect of yellow-safety-line designs on the behavior of passengers at the platform edge in metro stations. To this end, the yellow safety line was studied through full-scale experiments based on observations at existing stations in the Santiago Metro and the Valparaiso Metro, Chile. A method adapted from [16] was applied in the experiments. When analyzing the results obtained, it can be concluded that the yellow line that met requirements both in terms of safety and comfort was the 24 cm line (PVC with yellow pods), which should be considered a standard [11; 17] and is present in some stations of Line 1 of the Santiago Metro. In addition, the 5 and 10 cm line did not provide safety to passengers, so it did not provide comfort either (the phenomenon of \"safety offers comfort\"), except for the person with a wheelchair, since this line did not include a tactile texture. It was also observed that many people believed that the wider the yellow line, the greater the space between the train and the platform. This suggests that a greater width of the yellow line makes users feel a greater distance, making them respect the line more, and at the same time increases the feeling of safety. The 40 cm yellow line did not feel comfortable for many volunteers in \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Day** & **Train** & **Level of Compliance** & **Average** \\ \hline \multirow{8}{*}{\(1\)} & 1 & 4 & \\  & 2 & 4 & \\  & 3 & 4 & \\  & 4 & 4 & \\  & 5 & 4 & \\  & 6 & 4 & 4.0 \\  & 7 & 4 & \\  & 8 & 4 & \\  & 9 & 4 & \\  & 10 & 4 & \\  & 2 & 4 & \\  & 3 & 4 & \\  & 4 & 4 & \\
2 & 5 & 4 & 4.1 \\  & 7 & 4 & \\  & 8 & 4 & \\  & 9 & 5 & \\  & 10 & 4 & \\  & 2 & 4 & \\  & 3 & 4 & \\  & 4 & 4 & \\
3 & 5 & 5 & \\  & 6 & 4 & 4.2 \\  & 7 & 4 & \\  & 8 & 4 & \\  & 9 & 4 & \\  & 10 & 5 & \\ Average of the 3 days & & & 4.1 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Evaluation method of the level of compliance for the yellow safety line in Hospital Station in the Valparaiso Metro in the peak hour. the experiment, which suggests that it is not a good alternative for the metro system. This type of yellow safety line (40 cm) is perceived as unsafe by people in wheelchairs since the tactile pavement (width pods) produced vibrations and passengers may trip or fall when passing over. Even some people without disabilities or reduced mobility feel the same way. When looking at the results, it can be concluded that the 24 cm line is the ideal one to be used. In the case of the Santiago Metro, it was observed that most of the stations reached the variables defined to achieve accessibility on the platform according to the Accessibility Law [11]. It is important to note that the yellow safety line varied according to different widths and materials. However, in the case of the Valparaiso Metro, the platform of the Hospital Station, the level of compliance depended on the platform congestion. Using the method adapted from [16], the yellow safety line did not reach 100% because users, generally young passengers, when the train approaches, stand on the yellow safety line and later go back and locate themselves in a safe area closer to the platform edge until the door is opened to board the car. Therefore, this highlights that the characteristics of the yellow safety line at the edge of the platform allow people who step on the yellow line to get an alert to prevent them from falling onto the train tracks. Finally, as future recommendations, it is proposed to study other variables that affect passenger accessibility in metro stations, considering the different spaces and types of passenger that are present in a metro station. Although both the Santiago Metro and the Valparaiso Metro have improved their accessibility [2; 3], it is not enough for people with different disabilities or reduced mobility, since, as seen in this study, accessibility depends on both physical and functional variables. Conceptualization, S.S., A.V., D.L. and T.F. ; methodology, S.S. and T.F. ; software, P.A., C.B.