What is the statutory rule under KFG § 105 when towing a broken-down tractor on public roads?

1. A broken-down tractor may be towed at up to 40 km/h whatever the state of its brakes
2. Where the towed vehicle's steering or braking is defective, it must be towed on a rigid tow bar (Abschleppstange) rather than a rope
3. A flexible tow rope may always be used provided the gap stays under 5 metres
4. No steering or braking capability is needed in the towed vehicle as long as it is being pulled