If you are driving an unfamiliar vehicle, you should be conservative when:

When driving an unfamiliar vehicle, it is crucial to be conservative when braking and steering because these are fundamental aspects of controlling the vehicle's movements and safety. Each vehicle has different handling characteristics, brake responsiveness, and steering sensitivity. By being conservative, you allow yourself time to adjust to the vehicle's unique feel and ensure you maintain full control. This approach minimizes the risk of overreacting or miscalculating during maneuvers, especially in unexpected situations.

Taking this cautious approach helps prevent accidents that may occur due to sudden braking or turning too sharply in a vehicle that may not respond as anticipated. Building familiarity with how the vehicle behaves under various driving conditions is essential for safe operation. Other choices, while important in their right, do not directly impact the immediate control and safety needed while navigating in an unfamiliar vehicle.