The Bus-only lane sign indicates a lane designated specifically for buses. According to German traffic laws, vehicles other than buses are not permitted to use this lane, except for certain exceptions like taxis or vehicles that are picking up or dropping off passengers, as per local regulations. These lanes help ensure that buses can travel efficiently and without delay, improving public transport reliability. Drivers should always be aware of the specific rules applying to bus lanes in different areas, as well as the times when the restrictions may apply.