Which area is considered more dangerous during winter conditions?

The surface of a bridge is particularly dangerous during winter conditions primarily due to the way temperature affects road surfaces. Bridges are typically more exposed to the elements than other types of roadways, which means they can cool down faster and more evenly than roads that are insulated by the ground. As a result, ice can form on bridge surfaces more readily, often before it appears on regular roadways. This can lead to unexpectedly slippery conditions, which may catch drivers off guard.

In addition, bridges can be vulnerable to freezing even when the surrounding air temperature is slightly above freezing, creating a false sense of security for drivers. Understanding this characteristic is crucial for safe driving in winter conditions, highlighting why extra caution is advised when approaching bridges.