Jeep grand cherokee 2015 Owner's Manual page 215

ACC Hill Example
Lane Changing
ACC may not detect a vehicle until it is completely in the
lane in which you are traveling. In the illustration shown,
ACC has not yet detected the vehicle changing lanes and
it may not detect the vehicle until it's too late for the ACC
system to take action. ACC may not detect a vehicle until
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 213
it is completely in the lane. There may not be sufficient
distance to the lane-changing vehicle. Always be atten-
tive and ready to apply the brakes if necessary.
Lane Changing Example
3