TOYOTA PRIUS PRIME 2021 Owners Manual (in English)

PRIUS PRIME_OM_OM47D71U_(U)
4115-5. Using the driving support systems
5
Driving
When the front camera recognizes a sign, the sign will be displayed
on the main display or multi-information display.
●When the driving assist system
information is selected in multi-
information display, a maximum
of 2 signs can be displayed on
the multi-information display.
(P. 220)
●When a tab other than the driv-
ing assist system information is
selected, the following types of
road signs will be displayed on
the main display. (P. 2 0 9 )
• Speed limit sign
• Do Not Enter sign (when
notification is necessary)
If signs other than speed limit signs are recognized, they will be displayed
in an overlapping stack under the current speed limit sign.
The following types of road signs, including electronic signs and blink-
ing signs, are recognized.
A non-official or a recently introduced traffic sign may not be recognized.
Indication on the main display or multi-information display
Supported types of road signs
Speed limitDo Not Enter
StopYield

412
PRIUS PRIME_OM_OM47D71U_(U)
5-5. Using the driving support systems
In the following situations, the RSA system will notify the driver.
●When the vehicle speed exceeds the speed notification threshold of
the speed limit sign displayed, the sign display will be emphasized
and a buzzer will sound.
●When the RSA system recognizes a do not enter sign and deter-
mines that your vehicle has entered a no-entry area, the displayed
sign will flash and a buzzer will sound.
Depending on the situation, a notification function may not operate
properly.
■Setting procedure
P. 246
■Automatic turn-off of RSA sign display
In the following situations, a displayed speed limit sign and/or do not enter
sign will stop being displayed automatically:
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11[
●The road changes due to a left or right turn, etc.
In the following situations, stop and yield signs will stop being displayed auto-
matically:
●The system determines that your vehicle has passed the sign.
●The road changes due to a left or right turn, etc.
■Conditions in which the function may not operate or detect correctly
In the following situations, RSA does not operate normally and may not rec-
ognize signs, display the incorrect sign, etc. However, this does not indicate a
malfunction.
●The front camera is misaligned due to a strong impact being applied to the
sensor, etc.
●Dirt, snow, stickers, etc. are on the windshield near the front camera.
●In inclement weather such as heavy rain, fog, snow or sand storms
●Light from an oncoming vehicle, the sun, etc. enters the front camera.
●The sign is dirty, faded, tilted or bent.
●The contrast of electronic sign is low.
●<0024004f004f0003005200550003005300440055005700030052004900030057004b004800030056004c004a00510003004c00560003004b004c004700470048005100030045005c00030057004b00480003004f0048004400590048005600030052004900
03004400030057005500480048000f00030044000300530052[le, etc.
●The sign is only visible to the front camera for a short amount of time.
●The driving scene (turning, lane change, etc.) is judged incorrectly.
●If a sign not appropriate for the currently traveled lane, but the sign exists
directly after a freeway branches, or in an adjacent lane just before merging.
●<00360057004c0046004e0048005500560003004400550048000300440057005700440046004b0048004700030057005200030057004b00480003005500480044005500030052004900030057004b00480003005300550048004600480047004c0051004a00
0300590048004b004c0046004f00480011[
Notification function

PRIUS PRIME_OM_OM47D71U_(U)
4135-5. Using the driving support systems
5
Driving
●A sign resembling a system compatible sign is recognized.
●Side road speed signs may be detected and displayed (if positioned in sight
of the front camera) while the vehicle is traveling on the main road.
●Roundabout exit road speed signs may be detected and displayed (if posi-
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51004a00030052005100030044000300550052005800510047[about.
●The front of the vehicle is raised or lowered due to the carried load
●The surrounding brightness is not sufficient or changes suddenly.
●When a sign intended for trucks, etc. is recognized.
●The speed information displayed on the meter and on the navigation system
may be different due to the navigation system using map data.
■Speed limit sign display
If the power switch was last turned off while a speed limit sign was displayed
on the main display or multi-information display, the same sign displays again
when the power switch is turned to ON mode.
■If “RSA Malfunction Visit Your Dealer” is shown
The system may be malfunctioning. Have the vehicle inspected by your Toy-
ota dealer.
■Customization
Some functions can be customized. (Customizable features: P. 753)

414
PRIUS PRIME_OM_OM47D71U_(U)
5-5. Using the driving support systems
Dynamic radar cruise controlwith full-speed
range
In vehicle-to-vehicle distance control mode, the vehicle automatically
accelerates, decelerates and stops to match the speed changes of the
preceding vehicle even if the accelerator pedal is not depressed. In
constant speed control mode, the vehicle runs at a fixed speed.
Use the dynamic radar cruise control with full-speed range on free-
ways and highways.
●Vehicle-to-vehicle distance control mode (P. 418)
●Constant speed control mode (P. 425)
Vehicle-to-vehicle distance
switch
Indicators
Multi-information display
Set speed
Cruise control switch
Summary of functions
System Components
1
2
3
4
5

PRIUS PRIME_OM_OM47D71U_(U)
4155-5. Using the driving support systems
5
Driving
WARNING
■Before using dynamic radar cruise control with full-speed range
●Driving safely is the sole responsibility of the driver. Do not rely solely on
the system, and drive safely by always paying careful attention to your sur-
roundings.
●The dynamic radar cruise control with full-speed range provides driving
assistance to reduce the driver’s burden. However, there are limitations to
the assistance provided.
Read the following conditions carefully. Do not overly rely on this system
and always drive carefully.
• When the sensor may not be correctly detecting the vehicle ahead:
P. 428
• Conditions under which the vehicle-to-vehicle distance control mode
may not function correctly:P. 429
●Set the speed appropriately depending on the speed limit, traffic flow, road
conditions, weather conditions, etc. The driver is responsible for checking
the set speed.
●Even when the system is functioning normally, the condition of the preced-
ing vehicle as detected by the system may differ from the condition
observed by the driver. Therefore, the driver must always remain alert,
assess the danger of each situation and drive safely. Relying solely on this
system or assuming the system ensures safety while driving can lead to
an accident, resulting in death or serious injury.
●Switch the dynamic radar cruise control with full-speed range setting to off
using the “ON-OFF” button when not in use.

416
PRIUS PRIME_OM_OM47D71U_(U)
5-5. Using the driving support systems
WARNING
■Cautions regarding the driving assist systems
Observe the following precautions, as there are limitations to the assistance
provided by the system.
Failure to do so may cause an accident resulting in death or serious injury.
●Assisting the driver to measure following distance
The dynamic radar cruise control with full-speed range is only intended to
help the driver in determining the following distance between the driver’s
own vehicle and a designated vehicle traveling ahead. It is not a mecha-
nism that allows careless or inattentive driving, and it is not a system that
can assist the driver in low-visibility conditions. It is still necessary for
driver to pay close attention to the vehicle’s surroundings.
●Assisting the driver to judge proper following distance
The dynamic radar cruise control with full-speed range determines
whether the following distance between the driver’s own vehicle and a
designated vehicle traveling ahead is within a set range. It is not capable
of making any other type of judgement. Therefore, it is absolutely neces-
sary for the driver to remain vigilant and to determine whether or not there
is a possibility of danger in any given situation.
●Assisting the driver to operate the vehicle
The dynamic radar cruise control with full-speed range does not include
functions which will prevent or avoid collisions with vehicles ahead of your
vehicle. 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 the safety of all involved.

PRIUS PRIME_OM_OM47D71U_(U)
4175-5. Using the driving support systems
5
Driving
WARNING
■Situations unsuitable for dynamic radar cruise control with full-speed
range
Do not use dynamic radar cruise control with full-speed range in any of the
following situations.
Doing so may result in inappropriate speed control and could cause an acci-
dent resulting in death or serious injury.
●Roads where there are pedestrians, cyclists, etc.
●In heavy traffic
●On roads with sharp bends
●On winding roads
●On slippery roads, such as those covered with rain, ice or snow
●On steep downhills, or where there are sudden changes between sharp up
and down gradients
Vehicle speed may exceed the set speed when driving down a steep hill.
●At entrances to freeways and highways
●When weather conditions are bad enough that they may prevent the sen-
sors from detecting correctly (fog, snow, sandstorm, heavy rain, etc.)
●When there is rain, snow, etc. on the front surface of the radar or front
camera
●In traffic conditions that require frequent repeated acceleration and decel-
eration
●During emergency towing
●When an approach warning buzzer is heard often

418
PRIUS PRIME_OM_OM47D71U_(U)
5-5. Using the driving support systems
This mode employs a radar to detect the presence of vehicles up to
approximately 328 ft. (100 m) ahead, determines the current vehicle-
to-vehicle following distance, and operates to maintain a suitable fol-
lowing distance from the vehicle ahead. The desired vehicle-to-vehi-
cle distance can also be set by operating the vehicle-to-vehicle
distance switch.
When driving on downhill slopes, the vehicle-to-vehicle distance may
become shorter.
Driving in vehicle-to-vehicle distance control mode

PRIUS PRIME_OM_OM47D71U_(U)
4195-5. Using the driving support systems
5
Driving
Example of constant speed cruising
When there are no vehicles ahead
The vehicle travels at the speed set by the driver.
Example of 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
necessary, the system applies the brakes (the stop lights will come on at
this time). The system will respond to changes in the speed of the vehicle
ahead in order to maintain the vehicle-to-vehicle distance set by the driver.
Approach warning warns you when the system cannot decelerate suffi-
ciently to prevent your vehicle from closing in on the vehicle ahead.
When the vehicle ahead of you stops, your vehicle will also stop (vehicle is
stopped by system control). After the vehicle ahead starts off, pushing the
cruise control lever up or depressing the accelerator pedal (start-off opera-
tion) will resume follow-up cruising. If the start-off operation is not per-
formed, system control continues to keep your vehicle stopped.
When the turn signal lever is operated and your vehicle moves to an over-
taking lane while driving at 50 mph (80 km/h) or more, the vehicle will
accelerate to help to overtake a passing vehicle.
The system’s identification of what is an overtaking lane may be deter-
mined solely based on the location of the steering wheel in the vehicle (left
side driver position versus right side driver position.) If the vehicle is driven
to a region where the overtaking lane is on a different side from where the
vehicle is normally driven, the vehicle may accelerate when the turn signal
lever is operated in the opposite direction to the overtaking lane (e.g., if the
driver normally operates the vehicle in a region where the overtaking lane
is to the right but then drives to a region where the overtaking lane is to the
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55005100030056004c004a00510044004f0003004c00560003[activated).
Example of acceleration
When there are no longer any preceding vehicles driving slower
than the set speed
The system accelerates until the set speed is reached. The system then
returns to constant speed cruising.
1
2
3

420
PRIUS PRIME_OM_OM47D71U_(U)
5-5. Using the driving support systems
Press the “ON-OFF” button to
activate the cruise control.
Dynamic radar cruise control indi-
cator will come on and a message
will be displayed on the multi-infor-
mation display.
Press the button again to deacti-
vate the cruise control.
If the “ON-OFF” button is pressed
and held for 1.5 seconds or more,
the system turns on in constant
speed control mode. (P. 425)
Accelerate or decelerate, with
accelerator pedal operation, to
the desired vehicle speed (at or
above approximately 20 mph
[30 km/h]) and push the lever
down to set the speed.
Cruise control “SET” indicator will
come on.
The vehicle speed at the moment
the lever is released becomes the
set speed.
Setting the vehicle speed (vehicle-to-vehicle distance control
mode)
1
2