Acura RLX HYBRID (2020 year). Manual in english — page 25

402

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When Driving

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Adaptive Cruise Control (ACC) with Low Speed Follow

Driving

Adaptive Cruise Control (ACC) with Low Speed
Follow

Helps maintain a constant vehicle speed and a set following-interval behind a vehicle
detected ahead of yours and, if the detected vehicle comes to a stop, decelerates
and stop your vehicle, without you having to keep your foot on the brake or the
accelerator.
When ACC with Low Speed Follow slows your vehicle by applying the brakes, your
vehicle's brake lights will illuminate.

1

Adaptive Cruise Control (ACC) with Low Speed Follow

Important Reminder

As with any system, there are limits to ACC with Low
Speed Follow. Use the brake pedal whenever
necessary, and always keep a safe interval between
your vehicle and other vehicles.

3

WARNING

Improper use of ACC with Low Speed
Follow can lead to a crash.

Use ACC with Low Speed Follow only when
driving on expressways or freeways and in
good weather conditions.

3

WARNING

ACC with Low Speed Follow has limited
braking capability and may not stop your
vehicle in time to avoid a collision with a
vehicle that quickly stops in front of you.

Always be prepared to apply the brake
pedal if the conditions require.

When to use

■

Vehicle speed for ACC with Low Speed Follow:

A vehicle is detected ahead within

ACC with Low Speed Follow range

– ACC with Low Speed Follow operates at

speeds up to 90 mph (145 km/h).

No vehicle is detected within ACC with Low Speed Follow range

– ACC with Low

Speed Follow operates at the speed of 25 mph (40 km/h) or above.

■

Gear position for ACC with Low Speed Follow: In

(

D

.

The radar sensor is
in the front grille.

The camera is
located behind
the rearview
mirror.

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When Driving

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Adaptive Cruise Control (ACC) with Low Speed Follow

Driving

■

How to activate the system

1

Adaptive Cruise Control (ACC) with Low Speed Follow

When the

MAIN

button is pressed, both ACC with

Low Speed Follow and the Lane Keeping Assist
System (LKAS) are either turned on or off.

ACC with Low Speed Follow may not work properly
under certain conditions.

2

ACC with Low Speed Follow Conditions
and Limitations

P. 407

When not using ACC with Low Speed Follow: Turn
off adaptive cruise by pressing the

MAIN

button. This

also will turn off the Lane Keeping Assist System
(LKAS).

Do not use Traffic Jam Assist under the following
conditions:

•

You are driving on a road with sharp curves.

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The system may not allow your vehicle to respond in

a manner best suited for the road conditions.

•

You are entering a toll booth, interchange, service
area, or parking area.

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If the vehicle ahead disappears from the travel path

of your vehicle, your vehicle may suddenly accelerate
to resume the set speed.

•

You are driving in bad weather (rain, fog, snow,
etc.).

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The system may not be able to correctly determine

the distance between your vehicle and the one
ahead.

•

The surface of the road is slippery, for example, it is
icy or covered with snow.

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The tires may slip, causing you to lose control of the

vehicle.

How to use

■

Press the

MAIN

button on

the steering wheel.

ACC

(green) is on in the

instrument panel.
ACC with Low Speed
Follow is ready to use.

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When Driving

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Adaptive Cruise Control (ACC) with Low Speed Follow

404

Driving

When driving at about 25 mph (40 km/h) or above:

Take your foot off the

pedal and press down the

RES/+

/

SET/–

switch when you reach the desired speed.

The moment you release the switch, the set speed is fixed, and ACC with Low Speed
Follow begins.

When driving at slower than about 25 mph (40 km/h):

If the vehicle is moving

and the brake pedal is not depressed, pressing the switch fixes the set speed to
about 25 mph (40 km/h) regardless of current vehicle speed. If the vehicle is
stationary, you can set the vehicle speed even with the brake pedal depressed.

When ACC with Low Speed Follow starts
operating, the vehicle icon, interval bars and
set speed appear on the multi-information
display.

■

To Set the Vehicle Speed

1

To Set the Vehicle Speed

You can switch the displayed set speed
measurements on the audio/information screen
between mph and km/h.

2

Customized Features

P. 295

On when ACC with
Low Speed Follow
begins

Press down and release

RES/+

/

SET/−

Switch

Set Vehicle Speed

Set Vehicle Interval

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Adaptive Cruise Control (ACC) with Low Speed Follow

Driving

■

There is a vehicle ahead

ACC with Low Speed Follow monitors if a vehicle ahead of you enters the ACC with
Low Speed Follow range. If a vehicle is detected doing so, the ACC with Low Speed
Follow system maintains or decelerates your vehicle’s set speed in order to keep the
vehicle’s set following-interval from the vehicle ahead.

2

To Set or Change Following-Interval

P. 410

When a vehicle whose speed is slower than your set speed is detected in front of
you, your vehicle starts to slow down.

■

When in Operation

1

When in Operation

If the vehicle detected ahead of you slows down
abruptly, or if another vehicle is detected cutting in
front of you, the beeper sounds, a message appears
on the multi-information display, and the head-up
warning come on.
Depress the brake pedal, and keep an appropriate
interval from the vehicle ahead.

Even if the interval between your vehicle and the
vehicle detected ahead is short, ACC with Low Speed
Follow may start accelerating your vehicle under the
following circumstances:

•

The vehicle ahead of you is going at almost the
same speed as, or faster than, your vehicle.

•

A vehicle that cuts in front of you is going faster
than your vehicle, gradually increasing the interval
between the vehicles.

You can also set the system to beep when a vehicle in
front of you comes in and goes out of the ACC with
Low Speed Follow detecting range. Change the

ACC

Forward Vehicle Detect Beep

setting.

2

Customized Features

P. 295

Beep

ACC with Low Speed Follow Range: 394 ft. (120 m)

A vehicle icon appears on the
multi-information display

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When Driving

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Adaptive Cruise Control (ACC) with Low Speed Follow

406

Driving

■

There is no vehicle ahead

Your vehicle maintains the set speed without
having to keep your foot on the brake or
accelerator pedal.
If there previously was a vehicle detected
ahead that kept your vehicle from traveling at
the set speed, ACC with Low Speed Follow
accelerates your vehicle to the set speed, and
then maintains it.

■

When you depress the accelerator pedal

You can temporarily increase the vehicle speed. In this case, there is no audible or
visual alert even if a vehicle is in the ACC with Low Speed Follow range.
ACC with Low Speed Follow stays on unless you cancel it. Once you release the
accelerator pedal, the system resumes an appropriate speed for keeping the
following-interval while a vehicle ahead is within the ACC with Low Speed Follow
range.

■

A vehicle detected ahead is within ACC with Low Speed Follow range and
slows to a stop

Your vehicle also stops, automatically. The

Stopped

message appears on the multi-

information display.
When the vehicle ahead of you starts again,
the vehicle icon on the multi-information
display blinks. If you press the

RES/+

/

SET/–

switch up or down, or depress the accelerator
pedal, ACC with Low Speed Follow operates
again within the prior set speed.

1

When in Operation

Limitations

You may need to use the brake to maintain a safe
interval when using ACC with Low Speed Follow.
Additionally, ACC with Low Speed Follow may not
work properly under certain conditions.

2

ACC with Low Speed Follow Conditions
and Limitations

P. 407

A vehicle icon with dotted-line
contour appears on the multi-
information display

1

A vehicle detected ahead is within ACC with Low Speed Follow
range and slows to a stop

3

WARNING

Exiting a vehicle that has been stopped
while the ACC with Low Speed Follow
system is operating can result in the vehicle
moving without operator control.

A vehicle that moves without operator
control can cause a crash, resulting in
serious injury or death.

Never exit a vehicle when the vehicle is
stopped by ACC with Low Speed Follow.

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Adaptive Cruise Control (ACC) with Low Speed Follow

Driving

The system may automatically shut off and the

ACC

indicator will come on under

certain conditions. Some examples of these conditions are listed below. Other
conditions may reduce some of the ACC functions.

2

Front Sensor Camera

P. 400

■

Environmental conditions

•

Driving in bad weather (rain, fog, snow, etc.).

■

Roadway conditions

•

Driving on a snowy or wet roadway (obscured lane marking, vehicle tracks,
reflected lights, road spray, high contrast).

■

Vehicle conditions

•

The outside of the windshield is blocked by dirt, mud, leaves, wet snow, etc.

•

An abnormal tire or wheel condition (Wrong sized, varied size or construction,
improperly inflated, compact spare tire

*

, etc.).

•

The camera temperature gets too high.

•

The parking brake is applied.

•

When the front grille is dirty.

•

The vehicle is tilted due to a heavy load or suspension modifications.

•

When tire chains are installed.

■

ACC with Low Speed Follow Conditions and Limitations

1

ACC with Low Speed Follow Conditions and Limitations

The radar sensor for ACC with Low Speed Follow is
shared with the Collision Mitigation Braking System

TM

(CMBS

TM

).

2

Collision Mitigation Braking System

TM

(CMBS

TM

)

P. 458

You can read about handling information for the
camera equipped with this system.

2

Front Sensor Camera

P. 400

Always keep the radar sensor cover clean.

Never use chemical solvents or polishing powder for
cleaning the sensor cover. Clean it with water or a
mild detergent.

Do not put a sticker on the radar sensor cover or
replace the radar sensor cover.

If you need the radar sensor to be repaired, or
removed, or the radar sensor cover is strongly
impacted, turn off the system by pressing the

MAIN

button and take your vehicle to a dealer.

Have your vehicle checked by a dealer if you find any
unusual behavior of the system (e.g., the warning
message appears too frequently).

* Not available on all models

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Adaptive Cruise Control (ACC) with Low Speed Follow

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Driving

■

Detection limitations

•

A vehicle suddenly crosses in front of you.

•

The interval between your vehicle and the vehicle ahead of you is too short.

•

A vehicle cuts in front of you at a slow speed, and it brakes suddenly.

•

When you accelerate rapidly and approach the vehicle ahead of you at high
speed.

•

The vehicle ahead of you is a motorcycle, bicycle, mobility scooter, or other small
vehicle.

•

When there are animals in front of your vehicle.

•

When you drive on a curved or winding or undulating road that makes it difficult
for the sensor to properly detect a vehicle in front of you.

•

The speed difference between your vehicle and a vehicle in front of you is
significantly large.

•

An oncoming vehicle suddenly comes in front of you.

•

Your vehicle abruptly crosses over in front of an oncoming vehicle.

•

When driving through a narrow iron bridge.

•

When the vehicle ahead of you brakes suddenly.

•

When the vehicle ahead of you has a unique shape.

•

When your vehicle or the vehicle ahead of you is driving on one edge of the lane.

1

ACC with Low Speed Follow Conditions and Limitations

If the front of the vehicle is impacted in any of the
following situations, the radar sensor may not work
properly. Have your vehicle checked by a dealer:

•

The vehicle mounted onto a bump, curb, chock,
embankment, etc.

•

You drive the vehicle where the water is deep.

•

Your vehicle has a frontal collision.

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Adaptive Cruise Control (ACC) with Low Speed Follow

Driving

Increase or decrease the vehicle speed using the

RES/+

/

SET/–

switch on the steering

wheel.

•

Each time you press the switch up or down, the vehicle speed is increased or
decreased by about 1 mph or 1 km/h accordingly.

•

If you keep the switch pressed up or down, the vehicle speed increases or
decreases by about 5 mph or 5 km/h accordingly.

■

To Adjust the Vehicle Speed

1

To Adjust the Vehicle Speed

If a vehicle detected ahead is going at a speed slower
than your increased set speed, ACC with Low Speed
Follow may not accelerate your vehicle. This is to
maintain the set following-interval between your
vehicle and the vehicle ahead.

To increase speed

To decrease speed

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Adaptive Cruise Control (ACC) with Low Speed Follow

Driving

Press the

(interval) button to change the

ACC with Low Speed Follow following-
interval.
Each time you press the button, the following-
interval (the interval behind a vehicle detected
ahead of you) setting cycles through short,
middle, long, and extra long following-
interval.

Determine the most appropriate following-
interval setting based on your specific driving
conditions. Be sure to adhere to any
following-interval requirements set by local
regulation.

■

To Set or Change Following-Interval

Interval Button

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Adaptive Cruise Control (ACC) with Low Speed Follow

Continued

Driving

The higher your vehicle’s following-speed is, the longer the short, middle, long or
extra long following-interval becomes. See the following examples for your
reference.

When your vehicle stops automatically because a vehicle detected ahead of you has
stopped, the interval between the two vehicles will vary based on the ACC with Low
Speed Follow interval setting.

Following-interval

When the Set Speed is:

50 mph (80 km/h)

65 mph (104 km/h)

Short

84 feet

26 meters

1.1 sec

102 feet

31 meters

1.1 sec

Middle

111 feet

34 meters

1.5 sec

139 feet

43 meters

1.5 sec

Long

155 feet

48 meters

2.1 sec

202 feet

62 meters

2.1 sec

Extra
Long

204 feet

62 meters

2.8 sec

265 feet

81 meters

2.8 sec

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Adaptive Cruise Control (ACC) with Low Speed Follow

412

Driving

To cancel ACC with Low Speed Follow, do any
of the following:

•

Press the

CANCEL

button.

•

Press the

MAIN

button.

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ACC with Low Speed Follow indicator
goes off.

•

Depress the brake pedal.

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When the Low Speed Follow function
has stopped the vehicle, you cannot
cancel ACC with Low Speed Follow by
depressing the brake pedal.

■

To Cancel

1

To Cancel

Resuming the prior set speed:
After you have canceled ACC with Low Speed
Follow, you can resume the prior set speed while it is
still displayed. Press the

RES/+

/

SET/–

switch up.

The set speed cannot be set or resumed when ACC
with Low Speed Follow has been turned off using the

MAIN

button. Press the

MAIN

button to activate the

system, then set the desired speed.

CANCEL

Button

MAIN

Button

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Adaptive Cruise Control (ACC) with Low Speed Follow

Driving

■

Automatic cancellation

The beeper sounds and a message appears on the multi-information display when
ACC with Low Speed Follow is automatically canceled. Any of these conditions may
cause the ACC with Low Speed Follow to automatically cancel:

•

Bad weather (rain, fog, snow, etc.)

•

When the radar sensor in the front grille gets dirty.

•

The vehicle ahead of you cannot be detected.

•

An abnormal tire condition is detected, or the tires are skidding.

•

Driving on a mountainous road, or driving off road for extended periods.

•

Abrupt steering wheel movement.

•

When the ABS, VSA

®

or CMBS

TM

is activated.

•

When the ABS or VSA

®

system indicator comes on.

•

When the vehicle is stopped on a very steep slope.

•

When you manually apply the parking brake.

•

When the detected vehicle within the ACC with Low Speed Follow range is too
close to your vehicle.

•

When a detected vehicle goes out of the ACC with Low Speed Follow range while
your vehicle is stationary.

•

The camera behind the rearview mirror, or the area around the camera, including
the windshield, gets dirty.

The ACC with Low Speed Follow automatic cancellation can be also triggered by the
following causes. In these cases, the parking brake will be automatically applied.

•

The driver’s seat belt is unfastened when the vehicle is stationary.

•

The vehicle stops for more than 10 minutes.

•

The power system is turned off.

1

Automatic cancellation

Even though ACC with Low Speed Follow has been
automatically canceled, you can still resume the prior
set speed. Wait until the condition that caused ACC
with Low Speed Follow to cancel improves, then
press the

RES/+

/

SET/–

switch up.

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Adaptive Cruise Control (ACC) with Low Speed Follow

414

Driving

Press and hold the

(interval) button for one

second.

Cruise Mode Selected

appears on

the multi-information display for two seconds,
and then the mode switches to Cruise.
To switch back to ACC with Low Speed
Follow, press and hold the

(interval) button

again for one second.

ACC Mode Selected

appears on the multi-information display for
two seconds.

■

When to use

Desired speed in a range above roughly 25 mph (40 km/h) ~.

Take your foot off the pedal and press the

RES/+

/

SET/–

switch down when you

reach the desired speed.
The moment you release the

RES/+

/

SET/–

switch, the set speed is fixed, and cruise

control begins. The

CRUISE CONTROL

indicator comes on.

Each time you press the

RES/+

/

SET/–

switch up or down, the vehicle speed is

increased or decreased by about 1 mph (1.6 km/h).
If you keep the

RES/+

/

SET/–

switch pressed up or down, the vehicle speed increases

or decreases until you release it. This speed is then set.

■

To Switch ACC with Low Speed Follow to Cruise Control

1

To Switch ACC with Low Speed Follow to Cruise Control

Always be aware which mode you are in. When you
are driving in Cruise mode, the system will not assist
you to maintain a following-interval from a vehicle
ahead of you.

ACC with
Low Speed
Follow ON

Cruise
Control ON

■

To Set the Vehicle Speed

■

To Adjust the Vehicle Speed

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Adaptive Cruise Control (ACC) with Low Speed Follow

Driving

To cancel cruise control, do any of the following:

•

Press the

CANCEL

button.

•

Press the

MAIN

button.

•

Depress the brake pedal.

The

CRUISE CONTROL

indicator goes off.

■

To Cancel

1

To Cancel

Resuming the prior set speed:
After cruise control has been canceled, you can still
resume the prior set speed by pressing the

RES/+

/

SET/–

switch up while driving at a speed of at

least 25 mph (40 km/h) or more.

You cannot set or resume in the following situations:

•

When vehicle speed is less than 25 mph (40 km/h)

•

When the

MAIN

button is turned off.

At vehicle speeds of 22 mph (35 km/h) or less, cruise
control canceled automatically.

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Road Departure Mitigation (RDM) System

Driving

Road Departure Mitigation (RDM) System

Alerts and helps to assist you when the system detects a possibility of your vehicle
unintentionally crossing over detected lane markings and/or leaving the roadway
altogether.

The front camera behind the rearview mirror
monitors left and right lane markings (in white
or yellow). If your vehicle is getting too close
to detected lane markings without a turn
signal activated, the system, in addition to a
visual alert, applies steering torque and alerts
you with rapid vibrations on the steering
wheel, to help you remain within the detected
lane.

2

Customized Features

P. 295

As a visual alert, the

Lane Departure

message appears on the multi-information
display.

If the system determines that its steering input
is insufficient to keep your vehicle on the
roadway, it may apply braking.

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Braking is applied only when the lane
markings are solid continuous lines.

■

How the System Works

1

Road Departure Mitigation (RDM) System

Important Safety Reminder

Like all assistance systems, the RDM system has
limitations.
Over-reliance on the RDM system may result in a
collision. It is always your responsibility to keep the
vehicle within your driving lane.

The RDM system only alerts you when lane drift is
detected without a turn signal in use. The RDM
system may not detect all lane markings or lane or
roadway departures; accuracy will vary based on
weather, speed and lane marker condition. It is
always your responsibility to safely operate the
vehicle and avoid collisions.

You can read about handling information for the
camera equipped with this system.

2

Front Sensor Camera

P. 400

The RDM system may not work properly or may work
improperly under the certain conditions:

2

RDM Conditions and Limitations

P. 419

There are times when you may not notice RDM
functions due to your operation of the vehicle, or
road surface conditions.

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Road Departure Mitigation (RDM) System

Driving

The system cancels assisting operations when you turn the steering wheel to avoid
crossing over detected lane markings.

If the system operates several times without detecting driver response, the system
beeps to alert you.

1

Road Departure Mitigation (RDM) System

If LKAS is off and you have selected

Narrow

from the

customized options using the audio/information
screen, the message below will appear in case the
system determines a possibility of your vehicle
crossing over detected lane markings.

2

Customized Features

P. 295