What must be remembered with regard to vehicles with canvass covers?

The two correct points regarding vehicles with canvass covers highlight important safety considerations:

1. The requirement that canvass covers must not obstruct the driver's rear view through the outside mirrors is crucial for safe driving. Drivers need a clear view of their surroundings, especially when changing lanes or reversing, as obstruction can lead to accidents.

2. The sensitivity of unloaded trailers with high canvass cover superstructures to side winds is also critical. These trailers can become unstable in windy conditions, increasing the risk of losing control, particularly during overtaking or on open roads.

The third option, stating that a load must not be specially secured when vehicles have canvass covers, is incorrect as ensuring that loads are properly secured is essential for safe operation on the roads. This prevents loads from shifting, which can lead to accidents.

Understanding and adhering to these rules is important for road safety and compliance with regulations in Germany. It's essential to recognize all relevant factors to ensure both your safety and that of other road users.