When oncoming passing on a narrow road is difficult due to a stationary obstacle (e.g., a parked car or roadworks), which driver must yield?

1. The driver on whose side the obstacle is located must yield right-of-way to oncoming traffic.
2. The oncoming driver who has a clear lane must stop and yield.
3. The heavier vehicle always passes first.
4. Whichever vehicle flashes its headlights first passes first.