When may a tram be overtaken on the left?

The selected combination of options is correct because it accurately reflects the circumstances under which a tram may be overtaken on the left according to German traffic regulations.

1. In one-way streets, overtaking a tram on the left is permissible because there are no opposing traffic lanes that could create a hazard.
2. When the rails run too far to the right, overtaking is allowed as the left side is clear, ensuring the safety of all road users.

However, the third option, which relates to overtaking when the roadway to the right is blocked by vehicles, is also an important aspect of traffic regulation. It addresses cases where the tram cannot be passed safely on the right due to obstructions.

Understanding these rules helps ensure safety and compliance with traffic laws, as they dictate the proper way to navigate around trams without endangering yourself or others.