The latter is more common when taking longer trips where most people are going to the last stop, for example from Ollantaytambo to Urubamba. If you want to exit, you should press the button or just say loudly "¡Baja paradero!" or just ¡Bajo! (BAH-ho), and the driver will stop at http://cancindelobo76543.post-blogs.com/23656310/notas-detalhadas-sobre-atilla-y-lmaz