What is the risk associated with shaded areas and overpasses in winter?

The correct answer highlights the risk of concealed spots of ice that can form in shaded areas and under overpasses during winter. These regions are often the last to receive sunlight, leading to a slower melting process of ice and snow. As a result, drivers may not be aware of the slick conditions that can be present, increasing the likelihood of losing control of the vehicle if they encounter ice unexpectedly.

In shaded areas and under overpasses, the temperatures can be colder, which can cause water to freeze more quickly, creating a hidden hazard. This situation can catch drivers off guard, especially if they are not aware that icy conditions can persist even when other road sections appear clear and safe.

The other options, such as increased traffic, higher temperatures, or less road visibility, do not accurately capture the unique hazards posed by shaded areas and overpasses in winter driving conditions. These factors do not specifically address the concealed nature of the ice and the risk it poses to drivers navigating those areas.