Dodge 2016 Grand Caravan Owner's Manual page 141

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
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 139
Overtaking Traffic
If you pass another vehicle slowly (with a relative speed
of less than 15 mph (24 km/h) and the vehicle remains in
the blind spot for approximately 1.5 seconds, the warning
light will be illuminated. If the difference in speed
between the two vehicles is greater than 15 mph
(24 km/h), the warning light will not illuminate.
Overtaking/Approaching
3