Traffic Rules and Right-of-Way
Right-of-way rules exist to make drivers predictable. At an unmarked junction, the general principle is to yield to traffic already on the main road and to vehicles approaching from your right where no sign or signal controls the crossing. At a roundabout, traffic already circulating has priority; entering drivers give way. A vehicle turning across oncoming traffic must yield to that traffic, and a driver turning left across a pedestrian crossing must give way to pedestrians.
Emergency vehicles using sirens or flashing lights have priority; pull to the left, slow, and stop if needed to clear the way. Pedestrians on a zebra crossing always have the right of way. Keep left on two-lane roads unless overtaking. Overtaking is prohibited near junctions, bends, hill crests, bridges, and where a solid line runs down the centre. Maintain a safe following distance - the two-second rule in good conditions, doubled in rain or at night.
Traps in questions: the phrase "always" or "never" often marks a wrong option, because right-of-way is conditional. Another trap is confusing priority with immunity - an ambulance with a siren still stops at a red light unless a police officer directs otherwise. Also remember that a driver entering a main road from a side road or driveway must yield even if no sign is present.
Worked example: You arrive at a four-way junction with no signs at the same moment as a car on your right. You yield, because the vehicle on the right has priority.