During daytime, where is it permitted to use headlights to signal the intention to pass?

Answer: C — Outside city limits

Using headlights to signal an intention to pass during the daytime is permitted outside city limits. This practice is part of safe driving techniques designed to improve visibility and communication between drivers, particularly on rural roads where there may be less traffic and visibility can be limited. By signaling with headlights, you can alert other drivers of your intentions to overtake safely. In contrast, within residential areas, school zones, and parking lots, there are usually a higher number of pedestrians and other vehicles in proximity, making the practice of signaling to pass less appropriate and potentially distracting or confusing to others on the road. Thus, outside city limits is the most suitable context for this action, as it maintains safety while allowing for more open road conditions.