When driving a tractor out of a farmyard gate (Ausfahrt) where your view of the footway and road is obstructed by buildings, what must you do under StVO § 19?

1. Edge out at walking pace and, if the view is still blocked, use a guide person (Einweiser) so that pedestrians and passing traffic are not endangered
2. Sound the horn once and pull out, since the horn discharges the duty to look
3. Pull out briskly so that the tractor clears the footway in the shortest possible time
4. Rely on the amber beacon, which obliges other road users to give way