Toyota Prius Plug-in Hybrid (2017 year). Instruction - part 24
5-5. Using the driving support systems
391
Warning message
Details/Actions
The LDA system cannot be used as
“Lane Departure Alert
the vehicle speed is less than approxi-
System is Unavailable
mately 50 km/h (32 mph).
Below Approx.
Drive the vehicle at approximately
50 km/h.”
50 km/h (32 mph) or more.
If a different warning message is displayed, follow the instructions displayed
on the screen.
■ Customization
The following settings can be changed.
Function
Setting details
Lane departure alert function
Adjust alert sensitivity
Steering control function
Turn steering wheel assistance on and off
Turn function on and off
Vehicle sway warning function
Adjust alert sensitivity
For how to change settings, refer to P. 242.
5
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5-5. Using the driving support systems
RSA (Road Sign Assist)
Summary of function
RSA recognizes specific road
Camera sensor
signs using the camera sensor
and provides information to the
driver via the main display or
multi-information display.
If the system judges that the vehicle is being driven over the speed
limit, performing prohibited actions, etc., in relation to the recognized
road signs, it alerts the driver using a warning display and warning
buzzer*.
*: This setting needs to be customized.
WARNING
■ Before using the RSA
Do not rely solely upon the RSA system. RSA is a system which supports
the driver by providing information, but it is not a replacement for a driver’s
own vision and awareness. Drive safely by always paying careful attention
to the traffic rules.
Inappropriate or negligent driving could lead to an unexpected accident.
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Indication on the main display or multi-information display
After the camera sensor recognizes a sign, it is displayed on the main
display or multi-information display when the vehicle passes the sign.
● 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. 215)
● When other than the driving
assist system information is
selected, speed limit sign or an
all canceled sign can be dis-
played on the main display.
(P. 207)
5
A no overtaking sign and a speed
limit sign with supplemental mark
are not displayed. However, if
signs other than speed limit signs
are recognized, they are men-
tioned in a stack under the current
speed limit sign.
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5-5. Using the driving support systems
Types of recognized road signs
The following types of road signs, including electronic signs and blink-
ing signs, are recognized.
A non-official (not meeting the Vienna Convention) or a recently introduced
traffic sign may not be recognized.
Type
Multi-information display
Speed limit begins/ends
Wet
Speed limit with
supplemental
Rain
mark
(Displayed simul-
taneously with
Ice
speed limit)
On/off ramp*
(Display example)
Supplemental
mark exists
(Contents not rec-
ognized)
No overtaking begins/ends
All canceled
(All restrictions canceled. Returns to
default road regulation.)
*: If the turn signal indicator is not operated when changing lanes, the mark
does not display.
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Warning display
In the following situations, the RSA system alerts the driver using a
warning display.
● When the vehicle speed exceeds the speed warning threshold
applied to the speed limit of the sign displayed on the main display
or multi-information display, the sign color becomes inverted.
● If it is detected that your vehicle is overtaking when a no overtaking
sign is displayed on the multi-information display, the sign flashes.
Depending on the situation, traffic environment
(traffic direction,
speed, unit) may be detected incorrectly and a warning display may
not operate properly.
■ Automatic turn-off of RSA sign display
One or more signs automatically turn off in the following situations.
● A new sign is not recognized for a certain distance.
● The road changes due to a left or right turn, etc.
■ Conditions in which the function may not operate or detect correctly
5
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 camera sensor is misaligned due to a strong impact being applied to
the sensor, etc.
● Dirt, snow, stickers, etc., are on the windshield near the camera sensor.
● In inclement weather such as heavy rain, fog, snow or sand storms
● Light from an oncoming vehicle, the sun, etc., enters the camera sensor.
● The sign is dirty, faded, tilted or bent, and if an electronic sign, the contrast
is poor.
●All or part of the sign is hidden by the leaves of a tree, a pole, etc.
● The sign is only visible to the camera sensor for a short amount of time.
● The driving scene (turning, lane change, etc.) is judged incorrectly.
● Even if it is a sign not appropriate for the currently traveled lane, such a sign
exists directly after a freeway branches, or in an adjacent lane just before
merging.
● Stickers are attached to the rear of the preceding vehicle.
● A sign resembling a system compatible sign is recognized.
● The vehicle is driven in a country with a different direction of traffic.
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5-5. Using the driving support systems
●Side road speed signs may be detected and displayed (if positioned in sight
of the camera sensor) while the vehicle is traveling on the main road.
● Roundabout exit road speed signs may be detected and displayed (if posi-
tioned in sight of the camera sensor) while traveling on a roundabout.
● The speed information displayed on the meter and that displayed on the
navigation system may be different due to the navigation system using map
data.
■ When driving vehicle in country with different speed unit
Since RSA recognizes signs based on the set unit of the meter, it is neces-
sary to change the set unit of the meter. Adjust the set unit of the meter to the
speed unit of signs in the current location. (P. 242)
■ Turning the system on/off
The RSA can be enabled/disabled on the
screen (P. 242) of the multi-
information display.
■ 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.
■ Customization
Setting (e.g. speeding warning threshold) can be changed. (Customizable
feature: P. 708)
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Dynamic radar cruise controlwith full-speed
range
Summary of functions
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. 400)
● Constant speed control mode (P. 407)
1
Vehicle-to-vehicle distance but-
ton
2
Indicators
3
Display
5
4
Set speed
5
Cruise control switch
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5-5. Using the driving support systems
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.
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 on this system
or assuming the system ensures safety while driving can lead to an acci-
dent, resulting in death or serious injury.
■ 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 has limited capabil-
ity to prevent or avoid a collision with a vehicle traveling ahead. Therefore,
if there is ever any danger, the driver must take immediate and direct con-
trol of the vehicle and act appropriately in order to ensure the safety of all
involved.
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399
WARNING
■ To avoid inadvertent dynamic radar cruise control with full-speed
range activation
Switch the dynamic radar cruise control with full-speed range off using the
“ON-OFF” button when not in use.
■ 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, cyclers, 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.
5
● 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 sensor or
camera sensor
● In traffic conditions that require frequent repeated acceleration and decel-
eration
●When your vehicle is during emergency towing
● When an approach warning buzzer is heard often
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5-5. Using the driving support systems
Driving in vehicle-to-vehicle distance control mode
This mode employs a radar sensor to detect the presence of vehicles
up to approximately 100 m (328 ft.) ahead, determines the current
vehicle-to-vehicle following distance, and operates to maintain a suit-
able following distance from the vehicle ahead.
Note that vehicle-to-vehicle distance will close in when traveling on long
downhill slopes.
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1
Example of 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 dis-
tance button.
2
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 will resume fol-
low-up cruising.
3
Example of acceleration
5
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.
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5-5. Using the driving support systems
Setting the vehicle speed (vehicle-to-vehicle distance control
mode)
Press the “ON-OFF” button to
1
activate the cruise control.
Radar cruise control indicator will
come on and a message will be
displayed on the multi-information
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. 407)
Accelerate or decelerate, with
2
accelerator pedal operation, to
the desired vehicle speed
(above approximately 50 km/h
[30 mph]) 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.
If the lever is operated while the vehicle speed is below approximately 50
km/h (30 mph) and a preceding vehicle is present, the set speed will be
adjusted to approximately 50 km/h (30 mph).
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Adjusting the set speed
To change the set speed, operate the lever until the desired set speed
is displayed.
Increases the speed
1
(Except when the vehicle has been
stopped by system control in vehi-
cle-to-vehicle distance control
mode)
Decreases the speed
2
Fine adjustment: Momentarily
move the lever in the desired
direction.
Large adjustment: Hold the lever up or down to change the speed,
and release when the desired speed is reached.
In the vehicle-to-vehicle distance control mode, the set speed will be
increased or decreased as follows:
Fine adjustment: By 5 km/h (3.1 mph)*1 or 5 mph (8 km/h)*2 each time the
5
lever is operated
Large adjustment: Increases or decreases in 5 km/h (3.1 mph)*1 or 5 mph
(8 km/h)*2 increments for as long as the lever is held
In the constant speed control mode (P. 407), the set speed will be
increased or decreased as follows:
Fine adjustment: By 1 km/h (0.6 mph)*1 or 1 mph (1.6 km/h)*2 each time
the lever is operated
Large adjustment: The speed will continue to change while the lever is
held.
*1: When the set speed is shown in “km/h”
*2: When the set speed is shown in “MPH”
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5-5. Using the driving support systems
Changing the vehicle-to-vehicle distance (vehicle-to-vehicle dis-
tance control mode)
Pressing the button changes the
Preceding
vehicle-to-vehicle distance as fol-
vehicle mark
lows:
1
Long
2
Medium
3
Short
The vehicle-to-vehicle distance is
set automatically to long mode
when the power switch is turned
ON mode.
If a vehicle is running ahead of you, the preceding vehicle mark will also be
displayed.
Vehicle-to-vehicle distance settings (vehicle-to-vehicle distance
control mode)
Select a distance from the table below. Note that the distances shown
correspond to a vehicle speed of 80 km/h (50 mph). Vehicle-to-vehicle
distance increases/decreases in accordance with vehicle speed.
When the vehicle is stopped by system control, the vehicle-to-vehicle
distance will be about 3 m (10 ft.) to 5 m (16 ft.) regardless of the vehi-
cle-to-vehicle distance setting.
Distance options
Vehicle-to-vehicle distance
Long
Approximately 50 m (160 ft.)
Medium
Approximately 40 m (130 ft.)
Short
Approximately 30 m (100 ft.)
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405
Resuming follow-up cruising when the vehicle has been stopped
by system control (vehicle-to-vehicle distance control mode)
After the vehicle ahead of you
starts off, push the lever up.
Your vehicle will also resume fol-
low-up cruising if the accelerator
pedal is depressed after the vehi-
cle ahead of you starts off.
Canceling and resuming the speed control
Pulling the lever toward you
1
cancels the speed control.
The speed control is also canceled
when the brake pedal is
depressed.
(When the vehicle has been
5
stopped by system control,
depressing the brake pedal does
not cancel the setting.)
2
Pushing the lever up resumes the cruise control and returns vehicle
speed to the set speed.
However, when a vehicle ahead is not detected, cruise control does not
resume when the vehicle speed is approximately 40 km/h (25 mph) or less.
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Approach warning (vehicle-to-vehicle distance control mode)
When your vehicle is too close to
a vehicle ahead, and sufficient
automatic deceleration via the
cruise control is not possible, the
display will flash and the buzzer
will sound to alert the driver. An
example of this would be if
another driver cuts in front of you
while you are following a vehicle.
Depress the brake pedal to
ensure an appropriate vehicle-to-
vehicle distance.
■ Warnings may not occur when
In the following instances, warnings may not occur even when the
vehicle-to-vehicle distance is small.
● When the speed of the preceding vehicle matches or exceeds
your vehicle speed
● When the preceding vehicle is traveling at an extremely slow
speed
● Immediately after the cruise control speed was set
● When depressing the accelerator pedal
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Selecting constant speed control mode
When constant speed control mode is selected, your vehicle will main-
tain a set speed without controlling the vehicle-to-vehicle distance.
Select this mode only when vehicle-to-vehicle distance control mode
does not function correctly due to a dirty radar sensor, etc.
With the cruise control off,
1
press and hold the “ON-OFF”
button for 1.5 seconds or more.
Immediately after the
“ON-OFF”
button is pressed, the radar cruise
control indicator will come on.
Afterwards, it switches to the cruise
control indicator.
Switching to constant speed con-
trol mode is only possible when
operating the lever with the cruise
control off.
2
Accelerate or decelerate, with
5
accelerator pedal operation, to
the desired vehicle speed
(above approximately 50 km/h
[30 mph]) 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.
Adjusting the speed setting: P. 403
Canceling and resuming the speed setting: P. 405
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