In which scenario might legal maximum weights not be safe?

Legal maximum weights are defined to ensure that vehicles can operate safely on roadways. However, in mountainous regions, the terrain presents unique challenges that can exceed the safety comforts provided by legal weight limits.

When driving in mountainous areas, the steep grades can make it more difficult to control a heavy vehicle, especially during descents where brakes might overheat and become less effective. Additionally, the increased likelihood of sharp turns and narrow roads can complicate maneuverability, increasing the risk of accidents when operating at maximum weight.

In contrast, the other scenarios, such as light traffic, good weather, and night driving, do not inherently pose the same level of challenge to safety associated with maximum weights. Light traffic and good weather conditions typically allow for safer operation, while driving at night might require additional caution due to visibility but does not directly influence the safety related to weight limits like mountainous terrain does.