Final answer:
Bridges may become icy in cold weather even when the roads are dry due to faster cooling and exposure to cold air. This can make bridges more slippery and dangerous for drivers.
Step-by-step explanation:
In cold weather, bridges may become icy even when the roads are dry.
This occurs because bridges are exposed to cold air on both the top and bottom, allowing them to cool faster than the surrounding roads.
When moisture in the air comes into contact with the bridge surface, it freezes and creates ice.
For example, let's say the temperature drops below freezing at night, causing moisture in the air to condense and freeze on the bridges.
However, the roads remain dry because they are insulated by the ground, which takes longer to cool down.
As a result, the bridges will be icy even though the roads are dry.
This phenomenon is important to be aware of when driving in cold weather, as it can make bridges more slippery and dangerous compared to the adjacent roads.