Within a built-up area, what should you note when driving on a road where this traffic sign combination is displayed?

You are correct in understanding the meaning of this traffic sign combination. The blue sign with "Einbahnstraße" indicates a one-way street, meaning motor vehicles must travel only in the direction of the arrow. However, the additional white sign with the bicycle and arrows means that cyclists are allowed to travel in both directions on this street despite it being a one-way street for other vehicles.

According to German traffic rules:

1. Cyclists are permitted to move in both directions in a one-way street when this sign combination is displayed. This improves cycling accessibility and safety.

2. When overtaking cyclists, drivers must maintain a minimum passing distance of 1.5 meters to ensure safe passing and protect cyclists from potential hazards.

The third option about cyclists using footpaths is incorrect because in this context, cyclists are explicitly allowed to ride on the roadway in both directions. They do not have to stay on footpaths.

Understanding this helps you anticipate cyclists coming from both directions and maintain a safe distance while driving in a one-way street with this sign combination.