You want to exit a parking space and move into the moving traffic. What should you do?

The combination of choices 1, 2, and 3 is essential when exiting a parking space into moving traffic for several reasons:

1. **Endangering Moving Traffic**: When you exit a parking space, the first priority is to ensure that you do not endanger other road users. This means checking for oncoming vehicles and being aware of the surroundings.

2. **Indicating Before Moving Off**: Using your turn signal is crucial. It informs other drivers of your intention to enter the roadway. Failing to indicate can lead to misunderstandings and accidents.

3. **Noting Traffic Behind You**: Being mindful of the traffic behind you is also critical. It allows you to assess if it is safe to exit and helps prevent rear-end collisions, especially if you suddenly stop or slow down.

According to German traffic regulations, all three aspects are necessary to ensure safe transitions from parking spaces to active roadways, emphasizing the importance of communication, awareness, and caution.