Where does mandatory sign 4.1.1 'Drive Straight' (blue circle with an upward vertical white arrow) apply when installed at the beginning of a road section between intersections?

1. It applies only to the immediate crossroad 500 meters ahead.
2. It applies to the entire road section up to the next intersection, permitting right turns into adjacent territories (courtyards, gas stations) but prohibiting left turns and U-turns.
3. It prohibits turning right into courtyards or fuel stations.
4. It mandates that all vehicles must change into the left lane immediately.