What is prohibited when your vehicle is parked?

Leaving the engine running unattended while your vehicle is parked is prohibited primarily due to safety and environmental concerns. An unattended running engine poses a significant risk as it can lead to accidents, theft, or unauthorized use of the vehicle. Additionally, it contributes to unnecessary emissions, which have harmful effects on the environment. Parking in designated no-parking zones is also illegal but does not specifically pertain to the condition of the vehicle's engine. Using a cap on the fuel tank is a normal safety practice to prevent fuel leaks and does not pose any issues when parked. Turning off the engine while parked is a responsible action that helps to conserve fuel and reduce emissions, making it a good practice rather than a prohibition.