Toyota PRIUS ALPHA 2012 Quick Reference Manual page 284

2-4. Using other driving systems
Dynamic radar cruise control
Dynamic radar cruise control supplements conventional cruise con-
trol with a vehicle-to-vehicle distance control. In vehicle-to-vehicle
distance control mode, the vehicle automatically accelerates or
decelerates in order to maintain a set following distance from vehi-
cles ahead.
270
∗
Vehicle-to-vehicle distance
button
Display
Set speed
Indicators
Cruise control switch
∗
: If equipped