Intersections, Giving Way and Lane Use
The giving-way hierarchy
At intersections, work through a hierarchy. First obey signs, lines and signals. If a STOP or GIVE WAY sign applies to you, you must give way to traffic on the crossing road. At a roundabout, give way to vehicles already in the roundabout (in the NT, and in most Australian jurisdictions, you also indicate left to exit). At an uncontrolled intersection, give way to the right. When turning across oncoming traffic, give way to vehicles going straight ahead and to pedestrians crossing the road you are entering.
Turning and positioning
Keep left unless overtaking on multi-lane roads at higher speeds, and drive in the lane that matches your intended turn. Signal before changing lanes and before turning, and check blind spots. When turning right at an intersection, approach from as near the centre line as practicable; when turning left, keep close to the left kerb. U-turns are permitted only where not prohibited by a sign and only when you can do so safely without obstructing traffic.
Roundabouts and slip lanes
Enter a roundabout only when there is a safe gap, and stay in your lane through the roundabout. A slip lane with a give-way or stop line means you must give way before merging, even if you barely slow. Pedestrians at a crossing on the road you are leaving or entering must be given way to.
Traps in questions
Common traps: assuming a driver turning left must give way to a driver turning right from the opposite direction (the right-turner usually must give way); forgetting that a give-way line at a slip lane still requires you to give way; and treating a roundabout as a place where entering traffic has priority. Another trap is lane choice when turning - questions often show a driver in the wrong lane who must still follow the arrow or sign.
Rule of thumb
Ask in order: signs/signals, then lines, then the give-way-to-the-right default, then oncoming traffic when turning. If two rules seem to conflict, the more specific sign or signal wins.