The bus rapid transport system in Bogotá in Colombia is a very important case of how to move around safely and quickly in a non-polluting way in a city: very frequent buses, strongly protected routes, the same service, really, as an underground railway system, but much, much cheaper and can be done much more quickly, a brilliant idea in many more cities around the world that's developing.
El sistema de transporte de autobuses rápido de Bogotá, en Colombia, es un ejemplo importante de cómo movernos de forma segura, rápida y no contaminante en una ciudad: autobuses frecuentes, rutas muy protegidas, en realidad, muy similar al metro, pero mucho más barato,