The sign "Unilateral lane marking" refers to a type of road marking used to indicate that vehicles must keep to one side of the road. This marking typically consists of a solid line on one side of the lane indicating that traffic must stay on that side, while the other side may have either a dash or no marking at all, allowing for potential overtaking or passing.

In German traffic laws, this marking is used to facilitate smooth traffic flow and enhance safety. Drivers must adhere to the lane marking and stay in their designated lane, ensuring that they do not cross the solid line into oncoming traffic or other designated lanes.

Following this lane marking is essential to prevent accidents and maintain an orderly flow of vehicles on the road. Always be attentive to these markings and adjust your driving accordingly. If you have any additional questions about German traffic rules or other signs, feel free to ask!