When navigating a narrow roundabout with a large tractor and a long agricultural trailer, what must the driver take into consideration?

1. The trailer tracks slightly outside the tractor's path, so a tighter line is needed
2. A tractor with a trailer must always use the outer lane of a multi-lane roundabout
3. Off-tracking disappears once the combination is longer than 12 metres
4. The trailer wheels cut inside the tractor's path (Kurvenschneiden), so the tractor must take a wider line while making sure following traffic is not endangered