On a motorway (autopista) where the maximum speed for cars is 130 km/h and no specific minimum is posted, what is the statutory minimum speed under Article 52 of Ley 24.449?

1. 40 km/h
2. 65 km/h — on urban roads and autopistas the statutory minimum is half of the maximum fixed for that type of road
3. 80 km/h
4. There is no minimum speed on motorways