What vehicles may be parked alongside other parked cars on the roadway?

In general, parking “alongside” other parked cars on the roadway means double parking, which is normally not allowed because it blocks traffic and reduces the usable width of the road.

The key exception in German rules is for taxis: taxis are allowed to stop next to parked vehicles briefly when this is necessary for passengers to get in or out. The idea is that this is a short, passenger-related stop, not ordinary parking, and it must be done in a way that still minimizes obstruction and danger.

Answer 2 is not correct because loading or unloading does not automatically permit double parking. Even if you are “only” delivering or picking something up, you still must stop/park only where stopping is allowed and without blocking the roadway; otherwise you must find a legal place or use a designated loading zone.

Answer 3 is not correct because hazard lights never create a “right” to park or stop illegally. They are only a warning signal. Switching them on does not legalize double parking or stopping where it’s prohibited.

Rule of thumb for similar questions: “Hazard lights don’t grant permission” and “deliveries don’t justify blocking,” but taxis have a limited privilege for passenger boarding/alighting.