Cochabamba is a city and municipality in central Bolivia, in a valley in the Andes mountain range. It is the capital of the Cochabamba Department and is the fourth largest city in Bolivia.
To get out of Cochabamba and the nearby town of Quillacollo first take any trufi (minibus) - 204, 205, 206, 208, 209, 250, 260, 261, 270 amongst others - from Cochabamba to Plaza Bolívar en Quillacollo (2,50BS/0,31€). From here find trufi 261 going towards Suticollo (2,50BS/0,31€) (You can find it on the far corner of the square in the needed direction - this is its first stop, because there also goes the city trufi 261, which does not suit you). Usually there is a sign "Tranca Suticollo" on the right trufi. Tell the driver that would like to get off at the toll booth (tranca) (17°28′17.38″S 66°20′20″W) on the main road (F4). You can start hitching right after the toll booth and also talk to plenty of trucks.