At an uncontrolled intersection of roads of equal priority, what is the right-of-way obligation for a Category C heavy truck?

1. The truck must yield right-of-way to all vehicles approaching from its right, regardless of vehicle size or weight (pravilo desne strane)
2. The truck has automatic priority over smaller cars due to its mass
3. The truck has priority if it is carrying a full commercial load
4. The truck only yields to emergency vehicles and pedestrians