Final answer:
Younger drivers are the most at risk of nighttime accidents due to reduced experience, while experienced drivers are least at risk due to heightened awareness.
Step-by-step explanation:
Among the groups listed, younger drivers are most at risk of nighttime accidents primarily due to their reduced experience.
On the other hand, experienced drivers are generally at the least risk because they tend to have a heightened awareness on the road, which can help them anticipate and avoid potential hazards more effectively than less experienced drivers.
Elderly drivers might be at a higher risk due to impaired vision, especially at night, but the actual risk could depend on individual health factors.
Middle-aged drivers could potentially be overconfident, but this is also dependent on the individual driver’s attitude and driving habits. It is important to note that these are general trends and the actual risk can vary on a case-by-case basis.