When are running lights required to be on for buses operating on city streets?

The requirement for running lights to be on for buses operating on city streets is specifically tied to visibility and safety regulations that change with the time of year and natural light conditions. Before 6 PM in December, the days are shorter, and there is often a higher risk of reduced visibility due to early darkness. This makes it critical for buses to have their running lights on to ensure they are seen by other vehicles and pedestrians, thus enhancing safety on the roads.

This practice is not limited to just weekends, nor does it apply all day in January, as conditions can vary. The safety measures are particularly emphasized in months with shorter daylight hours, and running lights serve to make the buses more visible as it gets darker earlier in the evening. Therefore, the requirement for running lights before 6 PM in December aligns with safety guidelines established for urban transportation, making this option the most accurate choice.