On which journeys are you not allowed to transport persons who are standing up?

According to German traffic rules, transporting standing passengers is prohibited on journeys in non-regular traffic and in tourist traffic to holiday destinations (answers 1 and 2). This is because these types of traffic often involve longer distances or irregular routes where standing passengers pose a higher safety risk. In regular traffic (answer 3), such as on local city buses, standing passengers are generally allowed because the routes are shorter and stops are frequent, minimizing risk. Understanding this distinction helps ensure passenger safety during different types of bus services.