Final answer:
The two factors most affected by extreme weather conditions are traction and visibility, which are crucial for safe driving and are impacted by conditions like rain, snow, or fog.
Step-by-step explanation:
The two factors affected most by extreme weather conditions are traction and visibility. These elements are essential for safe driving conditions. Traction refers to the grip of tires on the road surface, which can be compromised by weather conditions such as rain, snow, or ice, leading to an increased risk of accidents. Visibility pertains to a driver's ability to see clearly, which is hindered by severe weather like fog, heavy rain, or snowstorms, reducing the ability to react to road hazards. Both factors are critical to consider when evaluating driving safety in adverse weather conditions.