Toyota Camry 2014 Manual page 220

2-4. Using other driving systems
The Rear Cross Traffic Alert function
The Rear Cross Traffic Alert functions when your vehicle is in
reverse. It can detect other vehicles approaching from the right or left
rear of the vehicle. It uses radar sensors to alert the driver of the
other vehicle's existence through flashing the outside rear view mirror
indicators and sounding a buzzer.
Approaching vehicles
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The Rear Cross Traffic Alert function detection areas
The areas that vehicles can be detected in are outlined below.
To give the driver a more consistent time to react, the buzzer can
alert for faster vehicles from farther away.
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Detection areas