## 1 Introduction  
Nowadays, most of the people across the world live in urban areas, and the UN expects this population to increase dramatically in the coming three decades. The leading causes are (1) the shift in the residence of people from rural communities to urban ones and (2) the growth of the whole population, adding 2.5 billion people to cities [1]. This trend is particularly marked in the case of in-development regions. As a precaution from the consequences of such a prospect, the Director of the Population Division of the UN stated that  
Managing urban areas has become one of the most important development challenges of the 21 st century. Our success or failure in building sustainable cities will be a major factor in the success of the post-2015 UN development agenda [2]. Accordingly, many of the low and middle-income countries will face critical challenges arising from the needs of their cities, including security, employment, health care, energy supply, education,housing, and transportation. As urbanization intensifies, sustainable development depends on the successful management of--often scarce--urban resources. Here, Information and Communication Technology (ICT) is mainly a matter of interest. During the last two decades, urban structures have become more digital and information-based, and there has been a decisive change in the living environment of citizens. However, they must be capable of further advances as ICT innovations emerge. These cities must gain a competitive edge by adopting new technologies, such as the Internet of Things (IoT), cloud computing, big data, and mobile computing (cf. [3]). The future so-called 'large' and'mega' cities must evolve towards sustainability to provide a satisfactory standard of living for their inhabitants. In this context, they must reach the longed-for status of 'Smart City' and 'Knowledge Society'. According to the Smart Cities Council [4], \"a smart city uses information and communications technology (ICT) to enhance livability, workability, and sustainability\". [PERSON] [5] prefers to use the concept 'Smart Community' (SC) because of the lack of a globally unified notion of what a city is (in terms of population, physical size, geographical location, among others). Accordingly, an SC is any community--regardless of its degree of urbanization--that responds efficiently and rapidly to the population's emerging needs. It is supposed to:  
1. Improve operations that impact its quality of life (e.g., economic vitality, education, employment, environmental footprint, health care, power supply, safety, and transportation). 2. Enable a shared understanding of what is happening in the 'city'. 3. Engage both citizens and (private and public) organizations. In this paper, we present a real-world web application that directly impacts the afore-mentioned Point 2. The case study occurs in Mexico, specifically in Ciudad Juarez (in the Mexican State of Chihuahua). Mexico is in the top five of countries with the fastest-growing urbanization degree [1]; and, additionally, Ciudad Juarez is the fifth largest city in that country and it is expected to become a 'large' city in the following years, according to the current UN's criteria. With a fast-increasing population, this city must provide structures that rapidly broadcast knowledge among all of the members of its community. This fact brings to light that Ciudad Juarez should evolve towards an SC urgently. In this sense, the case study falls into the UN's priorities. However, much work must be done to offer acceptable living conditions. The inception of this study arises from the need to notify citizens about traffic accidents.