Traffic Signs, Signals and Road Markings
Angola's road signs follow international (Vienna Convention) families, so learn them by shape and colour as well as by symbol. Circles give orders: red-bordered circles are prohibitions (no entry, speed limit, no overtaking), blue circles are mandatory instructions (turn left ahead, minimum speed, keep right). Triangles warn. Rectangles inform or guide. Octagons mean stop; inverted triangles mean give way. Learn the priority order: police officer's signals override traffic lights, which override signs, which override road markings.
Markings carry meaning too. A continuous centre line means do not cross; a broken line may be crossed when safe. Stop lines mark where you must halt at a stop sign or red light. Zebra crossings give pedestrians priority once they are on or stepping onto them. Hatched areas should not be entered unless bounded by a broken line and it is safe to do so.
Traps in questions: a sign that looks like a warning but is actually mandatory; a traffic light that is out of order (treat as give-way rules and proceed with caution); a flashing amber or a green arrow that applies only to the direction shown. Read the whole sign, including supplementary plates below it that limit the rule to certain times, vehicles or distances.
Rule of thumb: identify the family first (order, warning, information), then the specific meaning, then any supplementary plate. If a question describes conflicting instructions, apply the hierarchy and choose the most authoritative.