What is the difference between a rear cross-traffic alert system and a parking sensor?

[DiDelilah]

The differences between a rear cross-traffic alert system and a parking sensor can be summarized in three aspects: 1. Different functions: The rear cross-traffic alert (RCTA) system, as the name suggests, is designed to detect whether there are vehicles approaching from the sides at the rear. On the other hand, a parking sensor is used to detect obstacles and their distance directly behind the vehicle during reversing, making parking easier and safer. 2. Different sensors and installation: The sensors and their installation positions differ between the two. Generally, RCTA uses millimeter-wave radar sensors, which are installed inside the rear bumper beams on both sides of the vehicle and are not visible to the naked eye. Parking sensors typically use ultrasonic radar sensors, which are installed at the rear of the vehicle and are visible. 3. Different alert methods: RCTA provides alerts through "signal warnings + audible alarms." When it detects approaching vehicles from either side, it displays a signal warning on the corresponding position (such as the central control screen or BSD indicator lights on the rearview mirror) and emits an audible alert. In contrast, parking sensors produce increasingly rapid beeping sounds as the vehicle gets closer to an obstacle, eventually turning into a continuous tone to warn the driver.