Which of these is true about bad weather and driving conditions?

When road temperatures drop, bridges can indeed freeze before road surfaces. This occurs because bridges are exposed to cold air both above and below, allowing them to lose heat more rapidly than regular road surfaces, which are insulated by the ground. As a result, ice formation can happen on bridges before it occurs on the roads, making them particularly hazardous for drivers in cold weather conditions.

The other options do not accurately reflect safe driving practices or road conditions. For example, while rain can create slippery conditions, roads can become slick shortly after rain begins, especially due to the initial mixing of oil and water. Additionally, rising temperatures above freezing do not necessarily correlate with worsening driving conditions; rather, conditions might become safer as snow and ice melt. Lastly, heavy rain typically reduces tire traction rather than improves it, as the water can create a film that separates the tire from the road surface, leading to hydroplaning risks.