What should you do to help protect the environment?

You chose all correct answers. To help protect the environment as a driver in Germany, you should have your vehicle checked if there is too much exhaust smoke, since this indicates high emissions, which are harmful to air quality. You should switch off the engine if you expect to wait for an extended period, as idling produces unnecessary emissions. Finally, you should avoid unnecessary trips or driving back and forth, because every unnecessary kilometer increases pollution and fuel consumption. Following these practices reduces environmental impact and is in line with German road safety and environmental regulations.