## 1 Introduction  
Daily, people use metro stations to carry out different activities, aiming to provide a good Level of Service (LOS) to passengers. The LOS [1] is understood as an indicator that allows for classifying the level of congestion in transportation infrastructures, based on variables such as density, flow, and speed in relation to the people passing through a study area [2]. The problems related to the LOS are multiple and affect both the infrastructure and experience of passengers. If solutions to the LOS are not addressed, the available infrastructure at the metro station (e.g., the passenger platform) becomes overcrowded. As a result, accessibility problems increase (e.g., boarding and alighting times for passengers rise, congestion in specific sections of the platform grows, and interaction in the available space between users and the platform edge intensities) [3]. The way passengers board the train from the platform becomes inefficient due to significant congestion at certain train doors, affecting the entire network. Thus, the objective of this study is to evaluate an innovative proposal solution for configuring waiting areas on the platform to improve the accessibility, and therefore the LOS during higher crowding, thereby reducing boarding and alighting time per passenger per door and enhancing the passenger experience. From the perspective of sustainability, Chile as a nation is committed to the Sustainable Development Goals (SDGs) [4]. Among the 17 objectives of the SDGs, objective 11 (sustainable cities and communities) establishes the need to improve several aspects related to promoting sustainable, resilient, safe, and inclusive cities by 2030. Within the mobility issues, a specific target (target 11.2) related to objective 11 states the need for cities to provide access to safe, accessible, affordable, and sustainable transport systems, especially for vulnerable populations. Therefore, improving the accessibility by modifying the mobility spaces could reduce risks focused on vulnerable users who are moving in various types of spaces (e.g., considering different geographical contexts around stations), which are important steps toward promoting sustainable mobility. In the case of Valparaiso, it is crucial to study the accessibility in public transport, especially in the railway system. The service provided by the Empresa de Ferrocarriles del Estado de Valparaiso (EFE Valparaiso) on the Limache-Puerto route connects the boroughs of Valparaiso, Vina del Mar, Quilpue, Villa Alemana, and Limache, as well as the boroughs of Quillota, La Calera, and Limache Viejo, through a combination of bus and metro services. In recent years, demand has increased, reaching levels close to 20 million passengers annually, causing issues with accessibility [5]. One of the most crowded areas is the platform at stations such as Vina del Mar, Quilpue, or Francia, where space is needed for passengers to wait before boarding the metro within the company's facilities. The problem at Valparaiso metro stations lies in the fact that the passenger platform infrastructure has not been expanded, and as a result, the LOS in waiting areas has deteriorated, reaching density levels greater than four passengers per square meter. The operation is affected, highlighting problems in various areas, such as boarding and alighting times from the metro to the platform, the condition of the infrastructure, and the underutilization of available space on the platform. On the other hand, passengers are impacted because there is no adequate infrastructure to meet the current passenger demand, leading to congestion in specific areas of the platform, which increases interaction when moving through crowded areas due to the reduced distance between each passenger. Therefore, alternative methods are required to measure the accessibility, such as the use of detection and trajectories through computer vision [6] (see Figure 1).