How should drivers respond to a warning sign about a turn?

Drivers should slow down and prepare to maneuver when they see a warning sign about a turn. This action is crucial because warning signs are designed to alert drivers to upcoming conditions that may require alterations to their driving behavior. By reducing speed, drivers have adequate time to assess the situation and execute the necessary turn safely.

In addition, slowing down allows drivers to navigate curves more effectively and reduces the risk of losing control of the vehicle. Preparing to maneuver also entails being aware of surrounding traffic and any other obstacles that might be present, ensuring the safety of all road users.

Other options might imply a lack of responsiveness to the warning sign's message, which could lead to safety hazards. For instance, continuing straight at the same speed would not let a driver adjust to the upcoming turn, and signaling to indicate a turn without first slowing down might not be safe, as it does not address the need to approach the turn cautiously.