Dodge 2010 Grand Caravan Owner's Manual page 118

The BSM system monitors the detection zone from three
different entry points (Side, Rear, Front) while driving to
see if an alert is necessary. The BSM system will issue an
alert during these types of zone entries.
Entering From The Side
Vehicles that move into your adjacent lanes from either
side of the vehicle.
Side Monitoring
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 117
Entering From The Rear
Vehicles that come up from behind your vehicle on either
side and enter the rear detection zone with a relative
speed of less than 30 mph (48 km/h).
Rear Monitoring
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