La siniestralidad vial es un problema para los tomadores de decisiones en el sector público. Se prospecta que de continuar esta tendencia, para 2030 la mortandad por eventos viales se ubicaría como la quinta causa a nivel global. El objetivo de este estudio analiza el escenario de dos ciudades metropolitanas que han aplicado infraestructura vial encaminada a la sostenibilidad de la movilidad urbana. Para ello, se elaboró una escala de valoración cualitativa y por medio de estadísticas de siniestralidad vial se identificaron y compararon patrones de utilización de infraestructura peatonal, ciclista y transporte público masivo. Se prospecta que de seguir implementándose estas medidas, se tendría en las ciudades de Bogotá-Colombia y Guadalajara-México una reducción en las tasas de mortandad por siniestros viales superiores a un 30% en 2030.

Changes in the availability and accessibility of alternative energy sources have been observed in recent years. This study analyzes the economic viability of the use of photovoltaic solar energy systems in equipment for the control and inspection of drinking water pipes. For this, the consumption, costs and operating times were reviewed using conventional sources and photovoltaic energy. The air conditioning system was found to be outdated and needs to be replaced with a leaner, more efficient one. However, portable electric generators should not be disabled, since they will serve as a backup on days when sunshine is the minimum necessary to recharge the batteries, with a contribution of close to 13.5% of the energy. These findings are useful for systems that are part of the jacket dipping process (rehabilitation of trenchless drainage pipes) used by municipal companies that provide home services.

Many cities in Mexico experience recurrent floods, caused by changes in land use, the modification of surface and land runoff, the artificialization of areas initially intended for infiltration and recharge of groundwater and, in general, the insufficiency and deficiency of the local networks of urban drainage, incapable to evacuate the annual surpluses of precipitation. In this sense, the objective of this study evaluates the efficiency of an underground system of retention of rainwater in one of the main avenues of the city of Tepic, Mexico: Avenida Tecnologico. To this end, an analysis of the thematic contents and on-site inspection assisted by geographic information systems is carried out. Based on the systems approach and the logic of a qualitative model, it is concluded that the capacity of urban storm water networks for water evacuation is exceeded dimensionally. Also, it can be observed that retention systems can mitigate the urban entropy generated by the floods.