Acura RLX (2018 year). Manual - part 27

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When Driving

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Lane Keeping Assist System (LKAS)

Driving

The system can be used when the following conditions are met.
• The lane in which you are driving has detectable lane markers on both sides, and 

your vehicle is in the center of the lane.

• The vehicle speed is between 45 and 89 mph (72 and 144 km/h).
• You are driving on a straight or slightly curved road.
• The driver is gripping the steering wheel.

■

How to activate the system

1. Press the MAIN button.

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The LKAS indicator comes on in the 
multi-information display.
The system is ready to use.

2. Press the LKAS button.

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Lane outlines (dotted outer lines) appear 
on the multi-information display.
The system is activated.

■

When the System can be Used

1

When the System can be Used

If the vehicle drifts toward either left or right lane line 
due to the system applying torque, turn off the LKAS 
and have your vehicle checked by a dealer.

1

How to activate the system

You can have the head-up display show you the 
current state of Traffic Jam Assist.

2 Head-Up Display P. 119

MAIN Button

LKAS Button

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Lane Keeping Assist System (LKAS)

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Driving

3. Keep your vehicle near the center of the 

lane while driving.

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The dotted outer lines change to solid 
ones once the system starts operating 
after detecting the left and right lane 
markings.

To cancel the LKAS:
Press the MAIN or LKAS button.

The LKAS is turned off every time you turn the 
power system off, even if you turned it on the 
last time you drove the vehicle.

■

To cancel

1

To cancel

Pressing the MAIN button also turns ACC with LSF 
on and off.

MAIN Button

LKAS Button

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Lane Keeping Assist System (LKAS)

Continued

Driving

■

The system operation is suspended if 
you:

• The wipers are set to HI.

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Turning the wipers off resumes the 
LKAS.

• Decrease the vehicle speed to about 40 

mph (64 km/h) or less.

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Increasing the vehicle speed to about 45 
mph (72 km/h) or more resumes the 
LKAS.

• Depress the brake pedal.

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The LKAS resumes and starts detecting 
the lane lines again once you release the 
brake pedal.

• Your vehicle is driving to the right or the left 

of the lane.

■

The LKAS may automatically be suspended when:

• The system fails to detect lane lines.
• The steering wheel is quickly turned.
• You fail to steer the vehicle.
• Driving through a sharp curve.
• Driving at a speed in excess of approximately 89 mph (144 km/h).
Once these conditions no longer exist, the LKAS automatically resumes.

When the LKAS is suspended, 
the lane lines on the multi-
information display change to 
dotted lines, and the beeper 
sounds (if activated).

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Lane Keeping Assist System (LKAS)

Driving

■

The LKAS may automatically be canceled when:

It is possible that under any of the following circumstances, dotted outer lines will 
appear on the multi-information display, a buzzer will sound, and LKAS will be 
canceled automatically.
• The camera temperature gets extremely high or low.
• The camera behind the rearview mirror, or the area around the camera, including 

the windshield, gets dirty.

• The ABS or VSA® system engages.
The beeper sounds if the LKAS is automatically canceled.

The system may not detect lane markings and therefore may not keep the vehicle in 
the middle of a lane under certain conditions, including the following:

■

Environmental conditions

• Driving in bad weather (rain, fog, snow, etc.).
• Sudden changes between light and dark, such as an entrance or exit of a tunnel.
• There is little contrast between lane lines and the roadway surface.
• Driving into low sunlight (e.g., at dawn or dusk).
• Strong light is reflected onto the roadway.
• Shadows are cast across the lane lines (e.g., trees, buildings, guardrails, vehicle, 

etc.).

• Roadway objects or structures are misinterpreted as lane markers.
• Reflections on the interior of the windshield.
• Driving at night or in a dark condition such as a tunnel.

■

LKAS Conditions and Limitations

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Lane Keeping Assist System (LKAS)

Driving

■

Roadway conditions

• The lines are not very distinguishable from the surface of the road.
• Driving on a snowy or wet roadway (obscured lane marking, vehicle tracks, 

reflected lights, road spray, high contrast).

• Driving on a road with temporary lane markings.
• Faint, multiple, or varied lane markings are visible on the roadway due to road 

repairs or old lane markings.

• The roadway has merging, split, or crossing lines (e.g., such as at an intersection 

or crosswalk).

• The lane markings are extremely narrow, wide, or changing.
• The vehicle in front of you is driving near the lane lines.
• The road is hilly or the vehicle is approaching the crest of a hill.
• Driving on rough or unpaved roads, or over bumpy surfaces.
• When objects on the road (curb, guard rail, pylons, etc.) are recognized as white 

lines (or yellow lines).

• Driving on roads with double lines.

■

Vehicle conditions

• Headlight lenses are dirty or the headlights are not properly adjusted.
• The outside of the windshield is streaked or blocked by dirt, mud, leaves, wet 

snow, etc.

• The inside of the windshield is fogged.
• The camera temperature gets too high.
• An abnormal tire or wheel condition (wrong sized, varied size or construction, 

improperly inflated, compact spare tire

*

, etc.).

• The vehicle is tilted due to a heavy load or suspension modifications.
• The tires are equipped with snow chains.

* Not available on all models

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Traffic Jam Assist

Driving

Traffic Jam Assist

The traffic jam assist system uses a radar sensor mounted inside the front grille and 
a camera mounted to the upper portion of the windshield to detect and monitor left 
and right white (yellow) traffic lane lines as well as any vehicle ahead. Based on 
inputs from the radar sensor and camera, the system adjusts the speed of your 
vehicle to maintain a set interval between your vehicle and the one detected ahead. 
It also applies steering torque to keep your vehicle in the center of the detected lane 
when you are driving in heavy traffic.

■

How Traffic Jam Assist works

If you are in heavy traffic and Adaptive Cruise Control with Low Speed Follow is 
active, the traffic jam assist system, upon detecting the traffic lane lines and a vehicle 
ahead, will apply steering torque to help keep your vehicle in the center of the lane.
The system adjusts the speed of your vehicle to maintain a set interval between your 
vehicle and the one detected ahead.

1

Traffic Jam Assist

3

WARNING

Improper reliance on Traffic Jam Assist can 
cause a crash resulting in injury or death.
Always maintain full control over your 
vehicle even when this system is active. and 
only use when on expressways or freeways.
Traffic Jam Assist is not an autonomous 
driving system:

3

WARNING

Failure to securely park vehicle when 
stopped using Adaptive Cruise Control with 
Low Speed Follow is active can allow the 
vehicle to roll away, resulting in an crash 
causing injury or death.
Never stop the vehicle and exit it without 
placing it in Park and setting the parking 
brake.

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Traffic Jam Assist

Driving

When the driver takes direct control of steering, the steering assist function is 
temporarily canceled.
The torque applied to steering may not be noticeable when the driver has direct 
control of steering, or when the surface of the road is rough or uneven.

Front Sensor Camera

Detects vehicle 
ahead

Detects left and right 
white (yellow) traffic 
lane lines

Radar Sensor

When you use the turn signal to indicate a lane change, Traffic Jam Assist is 
temporarily deactivated. It is reactivated once the vehicle is traveling in the 
center of the lane and the system has detected the traffic lane lines and a 
vehicle ahead.

1

Traffic Jam Assist

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

2 Front Sensor Camera P. 402

Traffic Jam Assist may not always be able to detect 
lane division lines or a vehicle traveling ahead. 
Depending on weather and road conditions and 
other factors, Traffic Jam Assist may not function 
normally. Always be aware of your surroundings and 
the road conditions, and conduct yourself in a 
manner conducive to safe driving. Traffic Jam Assist 
may not function properly when you are driving 
through a sharp curve or repeatedly accelerating and 
decelerating.

Traffic Jam Assist may not work properly under the 
certain conditions:

2 Traffic Jam Assist: Conditions and 

limitations P. 436

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Traffic Jam Assist

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Driving

Traffic Jam Assist is activated when all of the following circumstances exist:
• LKAS is activate.
• ACC with LSF is active.
• The vehicle speed is between 0 and 45mph (0 and 72km/h) and there is a vehicle 

detected traveling ahead.

• The lane in which you are driving has detectable lane markers on both sides, and 

your vehicle is in the center of the lane.

• You are driving on a straight or slightly curved road.
• The driver is gripping the steering wheel.

Do not use Traffic Jam Assist in any of the following situations:
• You are traveling 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 adverse weather (rain, fog, snow, etc.).

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The system may not be able to correctly determine the interval 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.

• You are driving in a HOV lane and motorcycles are passing you to the side, or you 

are required to keep your vehicle to the right or the left of the lane.

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The system may not be able to correctly determine the vehicle ahead.

■

Traffic Jam Assist Activation

1

Traffic Jam Assist Activation

Refer to the following page for proper handling of 
the Adaptive Cruise Control with Low Speed Follow:

2 Adaptive Cruise Control (ACC) with Low 

Speed Follow (LSF) P. 404

Refer to the following page for proper handling of 
the Lane Keeping Assist System (LKAS):

2 Lane Keeping Assist System (LKAS) P. 423

Refer to the following page for steering buttons and 
displays:

2 How to Operate the Buttons on the 

Steering Wheel P. 401

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Traffic Jam Assist

Driving

■

When a vehicle is traveling ahead

When a vehicle ahead of yours is detected entering the Traffic Jam Assist detection 
area, Traffic Jam Assist adjusts the speed of your vehicle to maintain the selected 
interval between your vehicle and the one ahead. It also applies steering torque to 
keep your vehicle in the center of the detected lane.

Keep your vehicle near the center of the lane 
while driving.

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Traffic Jam Assist will be activated once 
the camera has detected the white 
(yellow) traffic lane lines on either side of 
the lane and the radar sensor and 
camera have detected a vehicle driving 
ahead.
The dotted outer lines change to solid 
ones and a vehicle icon appears on the 
multi-information display.

■

How Traffic Jam Assist Works

1

How Traffic Jam Assist Works

If your vehicle veers too far to the right or the left of 
the white (yellow) traffic lane lines while Traffic Jam 
Assist is active, deactivate Traffic Jam Assist and have 
an authorized Acura dealer inspect your vehicle.

In some cases the system cannot properly detect the 
traffic lane lines and, as a result, will not provide 
steering assistance.

2 Traffic Jam Assist: Conditions and 

limitations P. 436

If the driver takes his or her hands off the steering 
wheel or does not adequately maintain control of 
steering, the warning below will appear.

If the driver does not grip the steering wheel after the 
warning above has repeatedly appeared, a warning 
buzzer will sound and Traffic Jam Assist will be 
canceled.

You can have the head-up display show you the 
current state of Traffic Jam Assist.

2 Head-Up Display P. 119

Traffic Jam Assist has a detection range of 197 ft. (60m)

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Traffic Jam Assist

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Driving

■

When no vehicle is traveling ahead

If the vehicle detected ahead disappears from 
the travel path of your vehicle (for example, it 
changes lanes), Traffic Jam Assist will be 
deactivated temporarily and your vehicle will 
gradually accelerate until it reaches the set 
speed, after which it will maintain that speed.

1

How Traffic Jam Assist Works

If the vehicle detected ahead suddenly slows down, 
or if another vehicle is detected cutting in front of 
yours, a warning buzzer will sound, and a warning in 
the multi-information display and head-up warning 
will appear.

Depress the brake pedal and take direct control of 
steering.

Beep

Head-up Warning

The dotted outer lines and a 
vehicle icon with a dotted-line 
contour appear on the multi-
information display.

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Traffic Jam Assist

Driving

To cancel Traffic Jam Assist, you can do any of the following:
• Press the MAIN button.
• Press the LKAS button.
• When the ACC with LSF is deactivated.

■

When Traffic Jam Assist may automatically be suspended when:

The system is temporarily canceled automatically under the following circumstances.
• The system fails to detect lane lines.
• The vehicle ahead of you cannot be detected.
• The steering wheel is turned quickly.
• You fail to steer the vehicle.
• The vehicle in front of you is driving near the lane lines.

• The wipers are set to high.
• The interval between your vehicle and the one traveling ahead is over 197 feet 

(60m).

Once these conditions no longer exist, the Traffic Jam Assist automatically resumes.

■

Canceling Traffic Jam Assist

1

How Traffic Jam Assist Works

If you are traveling slower than the vehicle detected 
ahead or a vehicle that is detected cutting in front of 
you and the interval between your vehicle and the 
detected vehicle gradually increases, your vehicle will 
continue to follow that vehicle without emitting any 
warning, even if the interval between the vehicle is 
minimal.

1

When Traffic Jam Assist may automatically be suspended when:

You are traveling over 45mph (72km/h).

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When the speed of the vehicle reaches 45mph 

(72km/h), Traffic Jam Assist is deactivated and LKAS 
is activated instead. Once the speed of the vehicle 
drops to under 42mph (68km/h), Traffic Jam Assist 
is reactivated.

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Traffic Jam Assist

Driving

■

When Traffic Jam Assist may automatically be canceled when:

It is possible that under any of the following circumstances, broken lines 
representing traffic lane lines will appear in the multi-information display, a buzzer 
will sound, and Traffic Jam Assist will be canceled.
• The temperature of the camera is too high.
• The camera behind the rearview mirror, or the area around the camera, including 

the windshield, is dirty.

Under the following circumstances, some features of Traffic Jam Assist may not 
work.

■

Vehicle conditions

• The front grille is dirty.
• Headlight lenses are dirty or the headlights are not properly adjusted.
• The outside of the windshield is streaked or blocked by dirt, mud, leaves, wet 

snow, etc.

• The inside of the windshield is fogged up.
• Your vehicle is fitted with tires or wheels of differing size, type, or structure, or the 

tires are not properly inflated.

• The vehicle is tilted due to a heavy load or suspension modifications.
• The interval between your vehicle and the detected vehicle ahead of you is too 

short.

• Snow chains are installed on the tires.

■

Traffic Jam Assist: Conditions and limitations

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Traffic Jam Assist

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Driving

■

Environmental conditions

• Bad weather (rain, fog, snow, etc.).
• You are driving into low sunlight (e.g., at dawn or dusk).
• Strong light is reflected onto your vehicle or the roadway.
• Brightness in the immediate are suddenly changes between light and dark, such 

as at the an entrance or exit of a tunnel.

• The road has puddles or the surface of the road is shiny due to recent rainfall.
• Shadows are cast across the lane lines (e.g., trees, buildings, guardrails, vehicle, 

etc.).

• Spray or snow coming off the vehicle ahead.
• Driving at night or in a dark condition such as a tunnel.

■

Roadway conditions

Certain features of the road can interfere with proper camera operation. Here are 
some examples:
• The lines are not very distinguishable from the surface of the road.
• The section of the road has lane restrictions or temporarily marked lanes.
• The lines are faded, removed lines remain visible next to newer lines (duplicate 

lines), or the road is marked with tire tracks.

Faded lines

Duplicate lines

Tire tracks

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Traffic Jam Assist

Driving

• The roadway has merging, split, or crossing lines (e.g., such as at an intersection 

or crosswalk).

• The lane markings are extremely narrow, wide, or of inconsistent width.

• The lane lines are partly concealed by your vehicle or another vehicle.
• The road is hilly or the vehicle is approaching the crest of a hill.
• The vehicle is shaking considerably because of an uneven road surface, etc.
• Objects on the road (curb, guard rail, pylons, etc.) are recognized as white lines 

(or yellow lines).

• The lines appear distorted or they briefly disappear out of the camera detection 

range due to an uneven road surface.

• The road is unpaved, or has a rough or bumpy surface.
• The roads has double lines.
• The surface of the road is slippery due to icy or snowy conditions.
• Sections of the paved road are obscured by puddles or snow.
• The road has ruts.

Very wide or narrow traffic lane

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Traffic Jam Assist

Continued

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• The section of the road branches off or merges with another road.

■

Certain features of the road can interfere with proper radar sensor 
operation. Here are some examples:

• The road has curves, undulations, slopes, etc.

• The radar beam is reflecting off multiple items that are within close proximity of 

your vehicle. This can happen when you are driving, for example, across a narrow 
truss bridge.

Lane void of lines at junction

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Traffic Jam Assist

Driving

■

Detection limitations

• The vehicle ahead suddenly accelerates.
• The vehicle ahead is a panel truck or a vehicle whose shape is not of standard 

dimensions.

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

vehicle.

• The ground clearance of the vehicle ahead is unusually high.

• A vehicle suddenly cuts in front of yours. 

Radar detects upper 
section of an empty 
carrier truck.

Panel truck, 
tanker truck, 
etc.

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