At an intersection where sign 2.1 'Priority Road' is accompanied by plate 8.13 'Direction of Priority Road' (showing the main road turning left), how is right-of-way determined?

1. Drivers on the priority road apply the 'Priority to the Right' rule among themselves; drivers on secondary roads must yield to all priority road traffic and then apply the right-hand rule among themselves.
2. The vehicle traveling straight always has priority over the vehicle following the turning priority road.
3. All priority signs become void and the intersection becomes an equal uncontrolled crossroads.
4. The vehicle arriving first at the intersection enters first.