Ram Trucks 2013 С/V - Owner Manual - Manual (Page 142)

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). 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 10 mph (16 km/h), the warning
light will not illuminate.
Rear Monitoring
Overtaking/Approaching
140 UNDERSTANDING THE FEATURES OF YOUR VEHICLE