Additional traffic joining from the left ahead; which has priority?

• A. Joining traffic from left has priority
• B. Pedestrian priority
• C. All vehicles must stop
• D. Main carriageway has priority over joining traffic from right-hand lane of slip road

Answer: (D)

Traffic on the main carriageway has priority over vehicles joining from a slip road. When you’re on the slip road, you must give way to traffic already on the main road and only merge when there is a safe gap. Your position in the slip road—left or right lane—doesn’t change this rule: you’re still joining the main carriageway, so you must yield to main-road traffic. Pedestrian priority only applies at crossings, and a stop for all vehicles isn’t a general rule here unless a sign or signal requires it. So the correct principle is to merge only when the main road traffic allows it.