Answer:
When the driver is reversing the car
Step-by-step explanation:
The Rear Cross Traffic Alert (RCTA) is Nissan's risk of collision detector that warns drivers if one or more cars are approaching the rear of your car when backing up from a parking space.
Sensors around the back of the vehicle identify vehicles drawing nearer from the either way. A notice tone and glimmering light will appear and alert the driver to stop.