2023 TOYOTA PRIUS PRIME Owners Manual

3295-5. Using the driving support systems
5
Driving
*: If equipped
When the front camera detects a sign or information
of a sign is available from the
navigation system, the sign
will be displayed on the dis-
play.
 Multiple signs can be dis-
played.
Depending on the specifications of
the vehicle, the number of dis-
played signs may be limited.
■Operating conditions of sign
display
Signs will be displayed when the fol-
lowing conditions are met:
●The system has detected a sign
In the following situations, a dis-
played sign may stop being dis-
played:
●When a new sign has not been
detected for a certain distance
●When the system determines that
the road being driven on has
changed, such as after a left or
right turn
■Situations in which the display
function may not operate prop-
erly
In the following situations, the RSA
system may not operate properly
and may not detect signs or may
display the incorrect sign. However,
this does not indicate a malfunction.
●When a sign is dirty, faded, tilted
or bent
●When the contrast of an electronic
sign is low
●When all or part of a sign is hidden
by a tree, utility pole, etc.
●When a sign is detected by the
front camera for a short amount of
time
●When the driving state (turning,
changing lanes, etc.) is judged
incorrectly
RSA (Road Sign
Assist)*
The RSA system detects
specific road signs using
the front camera and/or nav-
igation system (when speed
limit information is avail-
able) and warns the driver
via displays and buzzers.
WARNING
■For safe use
●Driving safely is solely the
responsibility of the driver. Pay
careful attention to the sur-
rounding conditions in order to
ensure safe driving.
●Do not rely solely upon the
RSA. The RSA assists the
driver by providing road sign
information, but it is not a
replacement for the driver’s own
vision and awareness. Driving
safely is solely the responsibility
of the driver. Pay careful atten-
tion to the surrounding condi-
tions in order to ensure safe
driving.
■Situations in which the RSA
should not be used
When it is necessary to disable
the system: P.284
■Situations in which the sys-
tem may not operate properly
●Situations in which the sensors
may not operate properly:
 P.289
Display Function

3305-5. Using the driving support systems
●When a sign is immediately after a
freeway junction or in an adjacent
lane just before merging
●When stickers are attached to the
rear of a preceding vehicle
●When a sign similar to a system
compatible sign is detected as a
system compatible sign
●When a speed limit sign for a
frontage road is within detection
range of the front camera
●When driving around a round-
about
●When a sign intended for trucks,
etc. is detected
●When the navigation system map
data is out of date
●When the navigation system can-
not be used
In this case, the speed limit signs
displayed on the multi-information
display and navigation system dis-
play may differ.
In the following situations, the
RSA system will output a warn-
ing to notify the driver.
 If the vehicle speed exceeds
the speed warning threshold
of the speed limit sign dis-
played on the display, the
sign display will be empha-
sized and a buzzer will sound.
 When the RSA system
detects a do not enter sign
and determines that the vehi-
cle has entered a no-entry
area, the do not enter sign
displayed on the display will
flash and a buzzer will sound.
■Operating conditions of the
notification functions
●Excess speed notification function
This function will operate when the
following condition is met:
• A speed limit road sign is recog- nized by the system.
●No entry notification function
This function will operate when all of
the following conditions are met:
• More than one no entry road signs are recognized by the system
simultaneously.
• The vehicle is passing between no
entry road signs recognized by the
system.
 The following types of road
signs can be displayed.
However, non-standard or recently
introduced traffic signs may not be
displayed.
Notification function
Types of road signs sup-
ported
Speed limit
Do Not Enter
No U-turn
No Turn On Red

3315-5. Using the driving support systems
5
Driving
Depending on the specifica-
tions of the vehicle, signs may
be displayed overlapping.
 The following settings of the
RSA can be changed through
customize settings. ( P.628)
Stop
Yield
Warning
Changing RSA settings
Dynamic radar cruise
control
This dynamic radar cruise
control detects the pres-
ence of vehicles ahead,
determines the current vehi-
cle-to-vehicle distance, and
operates to maintain a suit-
able distance from the vehi-
cle ahead. The desired
vehicle-to-vehicle distance
can be set by operating the
vehicle-to-vehicle distance
switch.
Use the dynamic radar
cruise control only on high-
ways and expressways.
WARNING
■For safe use
●Driving safely is solely the
responsibility of the driver. Do
not overly rely on this system,
and pay careful attention to the
surrounding conditions in order
to ensure safe driving.
●The dynamic radar cruise con-
trol provides driving assistance
to reduce the driver’s burden.
However, there are limitations
to the assistance provided.
Read the following items care-
fully. Do not overly rely on this
system and always drive care-
fully.
Conditions under which the sys-
tem may not operate correctly:
 P.337

3325-5. Using the driving support systems
WARNING
●Set the speed appropriately
according to the speed limit,
traffic flow, road conditions,
weather conditions, etc. The
driver is responsible for confirm-
ing the set speed.
●Even if the system is operating
correctly, the condition of a pre-
ceding vehicle as recognized by
the driver and detected by the
system may differ. Therefore, it
is necessary for the driver to
pay attention, assess risks, and
ensure safety. Over-reliance on
this system to drive the vehicle
safely may lead to an accident
resulting in death or serious
injury.
■Precautions for the driving
assist systems
Observe the following precau-
tions, as there are limitations to
the assistance provided by the
system. Over-reliance on this sys-
tem may lead to an accident
resulting in death or serious
injury.
●Details of support provided for
the driver’s vision
The dynamic radar cruise control
is only intended to help the driver
in determining the distance
between the driver’s own vehicle
and a designated preceding vehi-
cle. It is not a system which allows
for careless or i nattentive driving,
and is not a system which assists
in poor visibility conditions.
The driver must pay attention to
their surroundings, even when the
vehicle stops.
●Details of support provided for
the driver’s judgement
The dynamic radar cruise control
determines whether the distance
between the driver’s own vehicle
and a designated preceding vehi-
cle is within a set range. It is not
capable of making any other type
of judgement. Therefore, it is
absolutely necessary for the
driver to remain vigilant and to
determine whether or not there is
a possibility of danger.
●Details of support provided for
the driver’s operation
The dynamic radar cruise control
does not include functions which
will prevent or avoid collisions
with vehicles ahead of your vehi-
cle. Therefore, if there is ever any
possibility of danger, the driver
must take immediate and direct
control of the vehicle and act
appropriately in order to ensure
safety.
■Situations in which the
dynamic radar cruise control
should not be used
Do not use the dynamic radar
cruise control in the following situ-
ations. As the system will not be
able to provide appropriate con-
trol, using it may lead to an acci-
dent resulting in death or serious
injury.
●Roads where there are pedes-
trians, cyclists, etc.
●When driving on a highway or
expressway entrance or exit
●When the approach warning
sounds frequently
●Situations in which the sensors
may not operate properly:
 P.289
●Situations in which the lane may
not be detected: P.291

3335-5. Using the driving support systems
5
Driving
Constant speed cruising
When there are no vehicles ahead
The vehicle drives at the speed set by the driver.
If the set vehicle speed is exceeded while driving down a hill, the set vehicle
speed display will blink and a buzzer will sound.
Deceleration and follow-up cruising
When a preceding vehicle driving slower than the set vehicle
speed is detected
When a vehicle is detected driving ahead of your vehicle, the vehicle auto-
matically decelerates and if a greater reduction in vehicle speed is neces-
sary, the brakes are applied (the stop lights will come on at this time). The
vehicle is controlled to ma intain the vehicle-to-vehicle distance set by the
driver, in accordance with changes in the speed of the preceding vehicle. If
vehicle deceleration is not sufficient an d the vehicle approaches the vehicle
ahead, the ap proach warning will sound.
Acceleration
When there are no longer any pr eceding vehicles driving slower
than the set vehicle speed
The vehicle accelerates until the set vehicle speed is reached and then
resumes constant speed cruising.
Starting off
Basic functions
A
B
C
D

3345-5. Using the driving support systems
If a preceding vehicle stops, the vehicle will also stop (controlled
stop). After the preceding vehicle starts off, pressing the “RES”
switch or depressing the accelerator pedal will resume follow-up
cruising (start off operation). If a start off operation is not performed,
the controlled stop will continue.
Vehicles with Traffic Jam Assist : While driving on a highway or
expressway, if a preceding vehicl e stops, your vehicle will stop
accordingly. On some highways and expressways, if the system
determines that the preceding vehicle starts off within approximately
3 minutes of stopping, a buzzer will sound and a message will be
displayed on the multi-information display to notify the driver, and
your vehicle will start off accordingly following the preceding vehicle.
(Extended resume time)
■Meter display
Multi-information display
Set vehicle speed
Indicators
■Switches Driving assist mode select
switch
Driving assist switch
“+” switch/“RES” switch
“-” switch
Cancel switch
Vehicle-to-vehicle distance
switch
■Setting the vehicle speed
1 Press the driving assist mode
select switch to select
dynamic radar cruise control.
The dynamic radar cruise control
System components
A
B
C
B
C
FD
E
Using the dynamic radar
cruise control
A
B
C
D
E
F

3355-5. Using the driving support systems
5
Driving
indicator will illuminate.
2Using the accelerator pedal,
accelerate or decelerate to
the desired vehicle speed
(approximately 20 mph [30
km/h] or more), and press the
driving assist switch to set
the set vehicle speed.
The set vehicle speed will be dis-
played on the multi-information dis-
play.
The vehicle speed at the moment
the switch is released will be the set
vehicle speed.
■Adjusting the set vehicle
speed
 Adjusting the set vehicle
speed using the switches
To change the set vehicle
speed, press the “+” switch or “-”
switch until the desired speed is
displayed. 1
Increase set vehicle speed
2 Decrease set vehicle speed
Short press adjustment: Press the
switch
Long press adjustment: Press and
hold the switch until the desired set
vehicle speed is reached.
The set vehicle speed will
increase or decrease as follows:
For the U.S. mainland, Hawaii
and Puerto Rico
Short press adjustment:
Increases or decreases by 1
mph (1.6 km/h) each time the
switch is pressed
Long press adjustment:
Increases or decreases in 1
mph (1.6 km/h) increments con-
tinuously while the switch is
pressed and held
Except for the U.S. mainland,
Hawaii and Puerto Rico
Short press adjustment: By 0.6
mph (1 km/h) or 1.6 km/h (1
mph) each time the switch is
pressed
Long press adjustment:
Increases or decreases in 3.1
mph (5 km/h) or 8 km/h (5 mph)

3365-5. Using the driving support systems
increments continuously while
the switch is pressed and held
Increasing the set vehicle
speed using the accelerator
pedal
1 Depress the accelerator
pedal to accelerate the vehi-
cle to the desired vehicle
speed.
2 Press the “+” switch.
■Canceling/resuming control
1 Press the cancel switch or
driving assist switch to cancel
control.
Control will also be canceled if the
brake pedal is depressed.
(If the vehicle has been stopped by
system control, depressing the
brake pedal will not cancel control.)
2 Press the “RES” switch to
resume control.
■Changing the vehicle-to-
vehicle distance
Each time the switch is pressed,
the vehicle-to-vehicle distance
setting will change as follows:
If a preceding vehicle is
detected, the preceding vehicle
mark will be displayed. The actual vehicle-to-vehicle
distance varies in accordance
with the vehicle speed. Also,
when the vehicle is stopped by
system control, it will be stopped
at a certain distance from the
preceding vehicle, depending on
the situation, regardless of the
setting.
■Operating conditions
●The D shift position is selected.
●The desired set speed can be set
when the vehicle speed is approx-
imately 20 mph (30 km/h) or more.
• If the vehicle speed is set while driving at below approximately 20
mph (30 km/h), the set vehicle
speed will be approximately 20
mph (30 km/h).
A
Illus-
tration Num- berVehicle-to-vehi-cle dis- tanceApproximate
Distance (Vehi- cle Speed: 60
mph [100 km/h])
1Extra longApproximately 200 ft. (60 m)
2LongApproximately 145 ft. (45 m)
3MediumApproximately 100 ft. (30 m)
4ShortApproximately 85 ft. (25 m)