About Towing a broken-down car: which statement is WRONG?
It does not matter which of the two drivers steers the towed vehicle — steering is steering.
'the distance between the two vehicles may be a maximum of 5 metres' and 'always keep the tow cable taut'. When towing, a shorter, taut cable is the safe choice, not a longer one.
'you may only tow one vehicle'. No exception for busy traffic or convenience.
Always keep the tow cable taut: the driver of the towed vehicle brakes a little more than the one in front.
Explanation
trap: steering-is-steering. Book p.169 - 'the power steering of the towed vehicle does not work because the engine is off. Therefore let the most experienced driver steer the towed vehicle.' That is an explicit preference, not a free choice