Stable road position helps other road users predict you and preserves safe clearance from hazards.
Normally keep well to the left, use lanes correctly and position early for the direction you intend to travel without unnecessary lane changes.
These examples are for understanding and practice; they are not a promise that a particular mistake will always receive a particular grade.
Straddling lane markings or drifting between lanes.
Positioning too close to the centre line or failing to take an appropriate position for a turn.