Jeep 2013 Grand Cherokee SRT - Owner Manual - Manual (Page 228)

To change the distance setting, press the Distance button
and release. Each time the button is pressed, the distance
setting adjusts between long, medium, and short.
If there is no vehicle ahead, the vehicle will maintain the
set speed. If a slower moving vehicle is detected in the
Distance Setting 2 Distance Setting 1
226 UNDERSTANDING THE FEATURES OF YOUR VEHICLE