When running in low light conditions, what safety measures are recommended?

Running in low light conditions poses unique hazards, primarily due to reduced visibility for both the runner and passing vehicles. Using reflective clothing and a light source is essential for enhancing visibility. Reflective gear catches the light from headlights, making the runner more noticeable to drivers and pedestrians. Additionally, a light source, such as a flashlight or headlamp, not only helps illuminate the path ahead to avoid obstacles but also makes the runner visible to others.

Considering the other options, running without any gear offers no protection or enhancement for safety in low light. Carrying extra water, while important for hydration, does not address visibility issues that are critical in such conditions. Running in a group can be a safety measure, but it may not always be feasible; thus, relying solely on this option does not ensure visibility. Therefore, the combination of reflective clothing and a light source is the most comprehensive approach to ensure safety when running in low light.