According to Article 45 of the Implementing Regulation, in which situation is a driver legally required to reduce vehicle speed significantly?

1. In inhabited areas, at bends, slopes and junctions, near hospitals, schools and places of worship, at pedestrian crossings, and when meeting animals
2. Only where a reduced-speed sign is posted, in school zones during term time, and inside tunnels and underpasses
3. Only when a marked police patrol or a fixed speed camera is visible on that stretch of carriageway
4. Only when driving a commercial transport vehicle whose laden weight exceeds forty tonnes