Ram Trucks 2012 С/V - Owner Manual - Manual (Page 227)

When displayed, static grid lines will illustrate the width
of the vehicle while a dashed center-line will indicate the
center of the vehicle to assist with aligning to a hitch/
receiver. The static grid lines will show separate zones that will help indicate the distance to the rear of the
vehicle. The following table shows the approximate
distances for each zone:
Zone Distance to the rear of the vehicle
Red 0 - 1 ft (0 - 30 cm)
Yellow 1 ft - 3 ft (30 cm - 1 m)
Green 3 ft or greater (1 m or greater)
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UNDERSTANDING THE FEATURES OF YOUR VEHICLE 225