The **RCTA (Rear Cross Traffic Alert)** system is a driver assistance system that activates when the vehicle is **reversing**. Its main function is to **alert the driver** if there are other vehicles behind that could pose a collision hazard. This is especially useful when exiting a parking space, as the system emits a warning sound if it detects a vehicle too close. Therefore, the RCTA is specifically designed for situations where the vehicle is backing up, ensuring that the driver is aware of any cross traffic that may not be visible at first glance.