What should you do if you want to go into a store to make a quick purchase?

Stopping the engine and setting the parking brake ensures that the vehicle is secure while you run into the store. This is important for safety reasons, as it prevents the vehicle from rolling away and minimizes the risk of theft or accidents. When the engine is turned off, you also eliminate any emissions and noise from the vehicle, which is better for the environment and contributes to a more pleasant environment for other shoppers.

In this scenario, safely securing the car is a priority. The other options do not prioritize safety or the law effectively. Keeping the engine running, for instance, could lead to idling unnecessarily, which is not only inefficient but also poses risks of carbon monoxide exposure, particularly in enclosed spaces or if the vehicle is parked too close to the entrance. It is also typically against parking regulations to leave an unattended vehicle with the engine running. Therefore, stopping the engine and properly securing the vehicle is the most responsible course of action.