Toyota Prius Prime 2021 Quick Reference Manual page 53

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This mode employs a radar sensor to detect the presence of a preceding vehicle
following distance and operates to maintain a preset following distance from the
vehicle ahead. These distances vary based on vehicle speed.
Note: Vehicle-to-vehicle distance will close in when traveling on long downhill
slopes.
(1)
Constant speed cruising when there are no vehicles ahead
The vehicle travels at the speed set by the driver. The desired vehicle-to-
vehicle distance can also be set by operating the vehicle-to-vehicle distance
control.
Deceleration cruising and follow-up cruising when a preceding vehicle
driving slower than the set speed appears
When a vehicle is detected running ahead of you, the system automatically
decelerates your vehicle. When a greater reduction in vehicle speed is
in order to maintain the vehicle-to-vehicle distance set by the driver. A warning
tone warns you when the system cannot decelerate sufficiently to prevent your
vehicle from closing in on the vehicle ahead.
LONG
MIDDLE
(default setting)
(2)
51
To change the vehicle­to­vehicle distance
Push the "
" button to cycle
through the settings, which will
change progressively.
Preceding vehicle
SHORT
(3)
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