Honda CR-V Owner's Manual page 516

The system will not detect a vehicle that approaches from directly behind your
vehicle, nor will it provide alerts about a detected vehicle when it moves directly
behind your vehicle.
The system does not detect or provide alerts for a vehicle that is moving away from
your vehicle, and it may detect or alert for pedestrians, bicycles, or stationary
objects.
* Not available on all models
uuParking Your VehicleuCross Traffic Monitor
1Cross Traffic Monitor
For proper operation, always keep the rear bumper
corner area clean.
Do not cover the rear bumper corner area with labels
or stickers of any kind.
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