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Unlike developed countries, where toll freeways typically have multiple lanes, a significant portion of Mexico's trunk highway system comprises two-lane toll highways (one-lane per direction). This article presents a descriptive analysis of traffic accident data reported on the two-lane toll highway system in Mexico to understand its current state of accidents. It was found that the global crash index on two-lane toll highways is approximately double that observed on the national highway network, revealing a higher accident rate on this type of road. Additionally, highway sections exhibiting a potential worsening trend in accident occurrence in the near future were identified. This study provides valuable information to decision-makers to enhance road safety management programs. [ABSTRACT FROM AUTHOR]

A partir de la mirada vigilante de la Didáctica de la Matemática en la enseñanza del Cálculo, buscamos caracterizar el conocimiento y trabajo matemático emergente de estudiantes de educación secundaria cuando resuelven tareas sobre la tasa de variación mediado por GeoGebra. Desde la teoría de Espacio de trabajo matemático, analizamos la producción matemática de estudiantes chilenos (16-17 años) y concluimos que dar sentido a la tasa de variación parte de un trabajo basado en procesos algorítmicos y un enfoque de interpretación/experimentación a la idea de variación y cambio subrayando el rol del artefacto, siendo singular establecer procesos de prueba y demostración.

From the Mathematical Didactics’ viewpoint about teaching Calculus, this paper aims to characterize the knowledge and mathematical work that emerges when high school students solve tasks about the rate of change mediated by GeoGebra. Based on the theory of Mathematical Working Spaces, we analyze the mathematical production of Chilean students (16- 17 years old) and conclude that making sense of the change rate starts from a work based on algorithmic processes and an interpretation/experimentation approach to the idea of variation and change emphasizing the role of the artefact, being particular to establish proof and demonstration processes. [ABSTRACT FROM AUTHOR]

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