You have to wait because a rail-crossing barrier is lowered. How can you now help protect the environment at this point?

Using the automatic start-stop system at a rail crossing where the barrier is lowered is important for environmental protection. This system helps reduce fuel consumption and emissions by automatically turning off the engine when the car is stationary for a while, such as while waiting for the barrier to lift.

In addition to that, engaging the parking brake can also contribute to preventing rolling and ensuring safety while waiting. However, shifting into first gear does not contribute to environmental protection and is not necessary in this context since the vehicle should remain stationary.

Therefore, the best approach is to use the automatic start-stop system and activate the parking brake to enhance environmental protection and ensure safety. Understanding these mechanisms not only aligns with German traffic laws but also helps in practicing responsible driving habits.