When parking on a public road, __________.

When parking on a public road, the requirement to set the parking brake and shift to park with an automatic transmission or first with a manual transmission is crucial for safety and vehicle security. This action helps prevent the vehicle from rolling away, especially on inclines. Engaging the parking brake adds an additional layer of security, ensuring that your vehicle remains stationary while unattended. This practice is a standard safety measure that contributes to the overall safety of the roadway for both the parked vehicle and other road users. Properly parking a vehicle in this manner reflects responsible driving behavior and adherence to road safety practices.

The other options contain elements that may not align with standard parking regulations or practices. For example, while taking the keys out of your vehicle is wise for preventing theft, it is not always explicitly required by Florida law. Additionally, while you should typically park on the right side of the roadway, one-way streets may permit parking to the left if it is safe and allowed. Each of these points emphasizes the importance of responsible parking, but the action of setting the parking brake and properly shifting the transmission is foundational for safety.