RAM 2013 Cargo VAN Owner's Manual page 143

Overtaking/Passing
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.
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 141
Stationary Objects
The BSM system will not alert you of objects that are
traveling in the opposite direction of the vehicle in
adjacent lanes.
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