At an intersection of roads of equal priority, what is the right-of-way relationship between a Category C heavy truck and a tram (tramvaj)?

1. The tram has priority over the heavy truck regardless of which side the tram approaches from
2. The heavy truck has priority because it has greater total laden weight
3. The right-hand rule applies strictly, so the tram yields if the truck is on its right
4. Whoever blows their horn first proceeds first