What is always required to drive with caution?

To drive with caution, maintaining due regard is essential. This concept encompasses the responsibility of a driver to take into consideration various factors such as weather conditions, road conditions, and the presence of other vehicles. Due regard reflects the understanding that operating a vehicle is not just about following traffic laws but also about being mindful of the surrounding environment and potential hazards. This means adjusting behavior based on these factors to ensure safety for all road users.

While full attention is crucial for safe driving, it is a part of exercising due regard rather than a standalone requirement. Emergency lights are necessary for certain situations but are not always required for cautious driving during regular conditions. Reduced speed is often a strategy employed when driving with caution, especially in specific contexts like bad weather or heavy traffic, but it is inherently a part of due regard rather than an independent requirement. Thus, due regard is the most comprehensive answer reflecting the essence of cautious driving.