What preventive measure can be taken to ensure safety during winter driving with air brakes?

Answer: A — Use anti-freeze additives or ensure the air system is drained of moisture

The correct answer emphasizes the importance of managing moisture in the air brake system during winter driving. Using anti-freeze additives or ensuring that the air system is drained of moisture helps prevent the formation of ice within the system. Moisture can condense and freeze in cold temperatures, which can lead to brake failure, reduced braking efficiency, or even a complete loss of braking capability. By removing moisture from the air system, drivers can significantly improve the reliability and functionality of their brakes in winter conditions. In contrast, increasing tire pressure can enhance vehicle performance in some cases, but it doesn’t directly address the specific challenges associated with air brake systems in winter conditions. Using winter tires is beneficial for overall traction and handling but does not specifically improve the air brake system's performance. Driving at reduced speeds may help prevent accidents in harsh weather, but it does not rectify potential issues with the air brakes caused by moisture, which is crucial for safe operation. Therefore, managing moisture in the air brake system via proper maintenance is a vital preventive measure for winter driving safety.