Dodge 2009 Caravan Owner's Manual page 111

UNDERSTANDING THE FEATURES OF YOUR VEHICLE 109
3
Overtaking/Passing Stationary Objects
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.