Acura RDX (2021 year). Manual in english - page 29

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Collision Mitigation Braking System

TM

 (CMBS

TM

)

Driving

■

Detection limitations

•

A vehicle or pedestrian suddenly crosses in front of you.

•

The distance between your vehicle and the vehicle or pedestrian 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 or pedestrian 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, 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 or pedestrian in front of 
you is significantly large.

•

An oncoming vehicle suddenly comes in front of you.

•

Another vehicle suddenly comes in front of you at an intersection, etc.

•

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

•

When driving through a narrow iron bridge.

•

When the lead vehicle suddenly slows down.

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Collision Mitigation Braking System

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TM

)

Continued

Driving

•

When there is a group of people in front of your vehicle walking together side by 
side.

•

Surrounding conditions or belongings of the pedestrian alter the pedestrian’s 
shape, preventing the system from recognizing that the person is a pedestrian.

•

When the pedestrian is shorter than about 3.3 feet (1 meter) or taller than about 
6.6 feet (2 meters) in height.

•

When a pedestrian blends in with the background.

•

When a pedestrian is bent over or squatting, or when their hands are raised or 
they are running.

•

When several pedestrians are walking ahead in a group.

•

When the camera cannot correctly identify that a pedestrian is present due to an 
unusual shape (holding luggage, body position, size).

■

Automatic shutoff

The CMBS

TM

 may automatically shut itself off and the CMBS

TM

 indicator (amber) 

comes and stays on when:

•

The temperature inside the system is high.

•

You drive off-road or on a mountain road, or curved and winding road for an 
extended period.

•

An abnormal tire condition is detected (wrong tire size, flat tire, etc.).

•

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

Once the conditions that caused the CMBS

TM

 to shut off improve or are addressed 

(e.g., cleaning), the system comes back on.

Limitations applicable to pedestrian detection only

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Collision Mitigation Braking System

TM

 (CMBS

TM

)

464

Driving

The CMBS

TM

 may activate even when you are aware of a vehicle ahead of you, or 

when there is no vehicle ahead. Some examples of this are:

■

When Passing

Your vehicle approaches another vehicle ahead of you and you change lanes to pass.

■

At an intersection

Your vehicle approaches or passes another vehicle that is making a left or right turn.

■

With Little Chance of a Collision

1

With Little Chance of a Collision

Do not paint, or apply any coverings or paint to radar 
sensor area. This can impact CMBS

TM

 operation.

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Collision Mitigation Braking System

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 (CMBS

TM

)

Driving

■

On a curve

When driving through curves, your vehicle comes to a point where an oncoming 
vehicle is right in front of you.

■

Through a low bridge at high speed

You drive under a low or narrow bridge at high speed.

■

Speed bumps, road work sites, train tracks, roadside objects, etc.

You drive over speed bumps, steel road plates, etc., or your vehicle approaches train 
tracks or roadside objects (such as a traffic sign and guard rail) on a curve or, when 
parking, stationary vehicles and walls.

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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, can decelerate 
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.

ACC with Low Speed Follow can not be activated if 
Intelligent Dynamics System setting is 

Snow

.

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

 or 

(

S

.

The radar sensor 
is behind the 
emblem.

The camera is 
located behind 
the rearview 
mirror.

Continued

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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

For directions on the proper handling of the radar 
sensor, refer to the following page.

2

Radar Sensor

 P. 497

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

2

Front Sensor Camera

 P. 495

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. 473

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).

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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Adaptive Cruise Control (ACC) with Low Speed Follow

468

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 slower than about 25 mph (40 km/h): 

If the vehicle is moving 

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

■

To Set the Vehicle Speed

1

Adaptive Cruise Control (ACC) with Low Speed Follow

Do not use ACC with Low Speed Follow under the 
following conditions:

•

On roads with heavy traffic or while driving in 
continuous stop and go traffic.

•

On roads with sharp turns.

•

On roads with steep downhill sections, as the set 
vehicle speed can be exceeded by coasting. In such 
cases, ACC with Low Speed Follow will not apply 
the brakes to maintain the set speed.

•

On roads with toll collection facilities or other 
objects between lanes of traffic, or in parking 
areas, or facilities with drive through access.

1

To Set the Vehicle Speed

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

2

Speed/Distance Units

 P. 138

2

Customized Features

 P. 341

On when ACC with Low 
Speed Follow begins

Press and release

RES/+

/

SET/–

 switch

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Adaptive Cruise Control (ACC) with Low Speed Follow

Continued

Driving

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

When you use ACC with Low Speed Follow, 
Straight Driving Assist (a feature of the Electric 
Power Steering system) is activated.
By enabling the steering system to 
automatically compensate for natural steering 
pull, Straight Driving Assist makes it easier for 
you to keep your vehicle in a straight line.

Set Vehicle Speed

Set Vehicle Interval

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Adaptive Cruise Control (ACC) with Low Speed Follow

470

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. 477

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 ahead of you slows down abruptly, or if 
another vehicle cuts in front of you, the beeper 
sounds, a message appears on the multi-information 
display, and the head-up warning lights

*

 flash.

Depress the brake pedal, and keep an appropriate 
interval from the vehicle ahead.

Beep

Head-up 
Warning Lights

*

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

A vehicle icon appears on the 
multi-information display.

* Not available on all models

Continued

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Adaptive Cruise Control (ACC) with Low Speed Follow

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.

1

When in Operation

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. 341

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. 473

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

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Adaptive Cruise Control (ACC) with Low Speed Follow

472

Driving

■

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.
If no vehicle is ahead of you before you 
resume driving, depress the accelerator pedal 
and ACC with Low Speed Follow will operate 
again within the prior set speed.

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.

Continued

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Adaptive Cruise Control (ACC) with Low Speed Follow

Driving

The system may automatically shut off and the 

ACC

 with Low Speed Follow 

indicator will come on under certain conditions. Some examples of these conditions 
are listed below. Other conditions may reduce some of the ACC with Low Speed 
Follow functions.

2

Front Sensor Camera

 P. 495

■

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 radar sensor cover 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

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

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.

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Continued

Driving

•

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.

Radar detects upper section of 
an empty carrier truck.

Panel truck, tanker 
truck, etc.

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476

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 pressing the switch 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 interval between your vehicle and 
the vehicle ahead.

When you depress the accelerator pedal and then 
press down and release the 

RES/+

/

SET/–

 switch, the 

current speed of the vehicle is set.

To increase speed

To decrease speed

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Adaptive Cruise Control (ACC) with Low Speed Follow

Continued

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 extra 
long, long, middle, and short following-
intervals.

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