In tropical regions, during the rainy season, trucks and drivers are put to the test when they travel on muddy tracks. In Brazil, the BR156 road has some dangerous sections which do not prevent Sandro, a truck enthusiast, from going to supply isolated villages in the heart of the Amazon forest. Benjamin, an experienced bus driver, faces similar challenges on the muddy roads of central Cameroon. In addition to the pitfalls linked to the presence of mud, he must deal with passengers and motorists who are sometimes impatient due to delays caused by the state of the road.