What do you have to observe in a traffic situation like this one?

In the traffic situation depicted, the key points to observe are essential for ensuring safety on the road:

1. Cross the center line to pass by an obstruction only when it is safe to do so. This includes checking for oncoming traffic and ensuring there is enough visibility.

2. When overtaking, you may cross the center line, but again, safety is crucial. Ensure that no other vehicles are approaching and that it is legal to overtake at that point.

3. It's critical not to cross the center line if doing so would endanger other traffic. This means maintaining awareness of surrounding vehicles and respecting traffic regulations to prevent accidents.

In summary, all three points are interconnected in promoting safe driving practices. Understanding and adhering to these rules help prevent dangerous situations and keep all road users safe.