The road markings show double yellow lines, which are common in many countries, but the specific style of the road surface and the red plastic barriers suggest a Latin American context. The lush, mountainous terrain with exposed rock faces is very characteristic of the Andean regions. The cyclists and the general atmosphere point towards a popular cycling route in Colombia, likely near Bogotá. I am moderately sure this is in Colombia.

then: forward

The double yellow lines and the presence of numerous cyclists on a winding mountain road strongly reinforce the Colombian Andes theory. The specific rock formations and the dense, high-altitude forest vegetation are typical of the roads leading up to the Alto de Patios near Bogotá. The rainy, overcast conditions are also very characteristic of this high-altitude region. I am quite confident this is in the mountains near Bogotá, Colombia.

then: guess