Dodge Grand Caravan 2019 Owner's Manual page 173

The BSM system is designed not to issue an alert on
stationary objects such as guardrails, posts, walls, foliage,
berms, etc. However, occasionally the system may alert on
such objects. This is normal operation and your vehicle
does not require service.
Overtaking/Passing
The BSM system will not alert you of objects that are
traveling in the opposite direction of the vehicle in adjacent
lanes.
Stationary Objects
SAFETY 171
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