What action is advisable when approaching a bridge in freezing conditions?

When approaching a bridge in freezing conditions, slowing down and preparing for possible icy conditions is the safest action. Bridges tend to freeze faster than regular roadways due to their elevated structure and exposure to colder air on both the top and bottom surfaces. This can result in hidden ice patches, also known as black ice, which are difficult to see but can cause a vehicle to lose traction. By reducing speed, you allow yourself more time to react to any unforeseen circumstances, and you decrease the risk of a loss of control if the bridge surface is indeed icy.

Maintaining a cautious approach not only enhances your safety but also helps ensure the safety of other road users. Other options, such as accelerating or driving at normal speed, could lead to losing control of the vehicle on an unexpected icy surface, while braking firmly may cause skidding. Therefore, slowing down is crucial in these specific and potentially hazardous conditions.