When may the driver of tractor A, travelling at less than 40 km/h, drive in the second lane?
Explanation
Vehicles that cannot travel faster than 40 km/h must keep to the rightmost lane. The exception is when they are overtaking, passing an obstacle, changing lanes to turn, or stopping on a one-way road.
KET reference: KET 122: vehicles whose design speed cannot exceed 40 km/h must use only the rightmost lane, except when overtaking, passing or changing lanes.