Traffic Jam Assist (TJA)

Traffic Jam Assist (TJA)*

The TJA is a system which consists of a headway control function and a steering assist function for reducing driver fatigue during traffic jams when driving on expressways or highways.

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WARNING

WARNING

WARNING

This system performs headway control to maintain a constant distance between your vehicle and a vehicle ahead at a preset vehicle speed without you having to use the accelerator or brake pedal. Even further, with the steering assist function, when vehicle lane lines are detected, the function assists the driver in keeping the vehicle within the lane lines. If lane lines are not detected, the function provides the driver driving assistance in keeping the vehicle along the motion path with the vehicle ahead.



Do not rely completely on TJA:

- The TJA is not an automated driving system. In addition, the functions have limitations. Do not rely completely on the system and always stay on course using the steering wheel.

- Set a vehicle speed within the speed limit according to the road conditions and the weather conditions.

- The TJA may not be able to detect a vehicle ahead depending on the type of vehicle ahead and its conditions, the weather conditions, and the road conditions. Additionally, the system might be unable to decelerate sufficiently if a vehicle ahead applies the brakes suddenly, another vehicle cuts into the driving lane, or the difference in vehicle speed between your vehicle and the vehicle ahead is larger, which could result in an accident. Check the surrounding conditions and always drive carefully while keeping a safe distance from vehicles ahead and on-coming vehicles.


For the purposes of safety, switch the TJA off when it is not being used.

Leaving the TJA turned on when it is not in use is dangerous as it could operate unexpectedly, resulting in an accident.


Do not use the TJA under the following conditions. Otherwise, it may result in an accident.

- General roads other than expressways or highways (Driving under these conditions using the TJA is not possible.)

- Roads with sharp curves and where vehicle traffic is heavy with insufficient space between vehicles, or roads where frequent and repetitive acceleration and deceleration occur (Driving under these conditions using the TJA is not possible).


- When entering and exiting interchanges, service areas, and parking areas of expressways (If you exit an expressway while headway control is in use, the vehicle ahead will no longer be tracked and your vehicle may accelerate to the set speed).

- Slippery roads such as icy or snow-covered roads and unpaved roads (Tires could spin causing you to lose vehicle control, or the stop hold control may not operate.)

- Long, descending slopes (to maintain distance between vehicles, the system automatically and continuously applies the brakes which could result in the loss of brake power.)

- Two-wheeled vehicles such as motorcycles or bicycles are ahead.

- Slopes with a steep gradient (The vehicle ahead may not be detected correctly, your vehicle may slip while stopped by the stop hold control, or it may accelerate suddenly after it starts moving.)

- Driving under bad weather conditions (rain, fog, and snow).

- Tires of a different specified size are used, such as a temporary spare tire.

- Tires with insufficient tread are used.

- The tire pressures are not adjusted to the specified pressure.

- The vehicle is being used to tow a camper or boat trailer.

- Tire chains are used.

- The vehicle is driven on roads with lane lines other than white (yellow) lines, such as an expressway.


Do not get out of the vehicle while the stop hold control is operating.

Getting out of the vehicle while the stop hold control is operating is dangerous as the vehicle may move unexpectedly and result in an accident. Before getting out of the vehicle, switch the TJA off, apply the parking brake, and then shift the selector lever to the P position.


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CAUTION

CAUTION

CAUTION

Heed the following

CAUTION

s so that the TJA can operate normally.

- Turn the system off when the vehicle is running on a chassis roller.

- Do not modify the vehicle's suspensions.

- Always use wheels of the specified size for the front and rear wheels. Consult an Authorized Mazda Dealer for tire replacement.


NOTE

- The headway control does not detect the following as physical objects.

- Vehicles approaching in the opposite direction


- Pedestrians

- Stationary objects (stopped vehicles, obstructions)

- If a vehicle ahead is traveling at an extremely low speed, the system may not detect it correctly.

- If there is a structure on the road or an object (such as a monorail) at a low height off the ground in front of the vehicle, the system may operate. Therefore, do not use the TJA.

- Do not use the TJA under conditions in which close proximity WARNINGs are frequently activated.

- If it is necessary to accelerate for a lane change or the vehicle ahead brakes suddenly causing you to close in on the vehicle rapidly, accelerate using the accelerator pedal or decelerate using the brake pedal depending on the conditions.

- While the TJA is in use, any intended engine braking does not occur even if you shift the selector lever. If deceleration is required, lower the vehicle speed setting or depress the brake pedal.

- While braking by the TJA control is operating, you might hear an operation sound, however, this does not indicate a problem.

- The brake lights turn on while braking by the TJA control is operating, however, they may not turn on while the vehicle is on a down slope at the set vehicle speed or traveling at a constant speed and following a vehicle ahead.

- Under the following conditions, the TJA may not be able to detect white (yellow) lines or vehicles ahead correctly and the TJA may not operate normally.

- The forward sensing camera (FSC) cannot recognize the area in front of the vehicle due to soiling or fog.

- The white (yellow) lane lines are less visible because of dirt or paint flaking.

- White (yellow) lane lines or vehicles ahead are less visible because of bad weather (rain, fog, or snow).

- The vehicle is driven on a temporary lane or section with a closed lane resulting from construction where there might be multiple white (yellow) lane lines, or they are interrupted.

- The camera picks up an obscure line, such as a temporary line being used for construction, or because of shade, unmelted snow, or grooves filled with water.

- The road surface is wet and shiny after rain, or there are puddles on the road.

- Heavy luggage is loaded in the luggage compartment or on the rear seat causing the vehicle to tilt.

- A vehicle in front of your vehicle is running near a white (yellow) lane line making it less visible.

- The windshield is dirty or foggy.

- The vehicle is driven through an intersection, a junction, or a fork in the road.

- While white (yellow) lane lines cannot be detected due to road or weather conditions.

- The surrounding brightness suddenly changes such as when entering or exiting a tunnel.


- The illumination of the headlights is weakened because of dirt or the optical axis is deviated at night.

- Back-light is reflected off the road surface or the road surface is wet and shiny after rain.

- The shade of a guardrail parallel to a white (yellow) lane line is cast on the road.

- The width of a lane is excessively narrow or wide.

- The road is excessively uneven.

- The vehicle is shaken after hitting a road bump.

- There are various road markings or division lines (lane markings) of various shapes near an intersection.

- The area in front of the forward sensing camera (FSC) is soiled or an object that obstructs the field of view is installed.

- Exhaust gas from the vehicle in front, sand, snow, and water vapor rising from manholes and grating, and water splashed into the air.

- The surroundings are dark such as during the early evening or early morning.

- A vehicle ahead with a certain taillight shape.

- A vehicle ahead veers off course from your vehicle's line of travel.

- A vehicle ahead is driving erratically.

- The vehicle is driven on roads with tight curves.


Headway control function

If a vehicle ahead is detected while traveling at a constant speed, the vehicle-ahead indication is displayed and headway control is performed.


Steering assist function

When lane lines are detected, the function assists the driver in keeping the vehicle within the lane lines. If lane lines are not detected, the function provides the driver driving assistance in keeping the vehicle along the motion path with the vehicle ahead.


NOTE

Steering assist limit WARNING

If the steering assist function cannot keep the vehicle within the lane lines while the steering assist function is operating, a WARNING sound is activated and a WARNING is displayed on the multi-information display to urge the driver to operate the steering wheel.

Instrument Cluster (Type A) Instrument Cluster (Type B)


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*1 *1


*1: Displayed on the basic display.


Traffic Jam Assist (TJA) Display Indication

The TJA setting status and operation conditions are indicated on the multi-information display and the active driving display.

Active driving display

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Vehicle ahead display

Vehicle ahead display

Vehicle ahead display

TJA distance between vehicle display


TJA set vehicle speed

TJA distance between vehicle display


TJA set vehicle speed

TJA distance between vehicle display


TJA set vehicle speed

Instrument Cluster (Type A)

Vehicle ahead display

Instrument Cluster (Type A)

Vehicle ahead display

Instrument Cluster (Type A)

Vehicle ahead display

Multi-information display

Instrument Cluster (Type B)

Vehicle ahead display

Multi-information display

Instrument Cluster (Type B)

Vehicle ahead display

Multi-information display

Instrument Cluster (Type B)

Vehicle ahead display

TJA distance between vehicle display

TJA distance between vehicle display

TJA distance between vehicle display

TJA

distance between vehicle display

TJA

distance between vehicle display

TJA

distance between vehicle display

*1

*1

*1

TJA set vehicle speed

Vehicle ahead display

TJA set vehicle speed

Vehicle ahead display

TJA set vehicle speed

Vehicle ahead display

TJA set vehicle speed

TJA set vehicle speed

TJA set vehicle speed

*1

*1

*1

*1: Displayed on the basic display.


Steering assist function display

When the steering assist function operates, the steering assist operation display on the display changes from white to green.


Multi-information display

Instrument Cluster (Type A) Instrument Cluster (Type B)



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*1 *1

Steering assist operation display Steering assist operation display

*1: Displayed on the basic display.

Active driving display

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Steering assist operation display


NOTE

You can view the multi-information display to check whether the steering assist is performing controls in conjunction with the traffic lane lines or a vehicle ahead. Inactive

Instrument Cluster (Type A) Instrument Cluster (Type B)


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*1

Steering assist operation display (white)

*1: Displayed on the basic display.

*1

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Steering assist operation display (white)


Active (vehicle ahead)

Instrument Cluster (Type A) Instrument Cluster (Type B)


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*1

Steering assist operation display (green)

*1: Displayed on the basic display.

Active (lane line)

*1

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Steering assist operation display (green)

Instrument Cluster (Type A) Instrument Cluster (Type B)


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*1

Steering assist operation display (green)

*1: Displayed on the basic display.

*1

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Steering assist operation display (green)


If there is a problem with the TJA, a message is displayed on the display. Check the details of the problem and then have your vehicle inspected by an Authorized Mazda Dealer.

Close Proximity WARNING

If your vehicle rapidly closes in on the vehicle ahead because the vehicle ahead applies the brakes suddenly while you are traveling in headway control, the WARNING sound activates and the brake WARNING is indicated in the display. Always verify the safety of the


surrounding area and depress the brake pedal while keeping a safer distance from the vehicle ahead. Additionally, keep a safer distance from the vehicles behind you.

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NOTE

In the following cases, the WARNINGs and brakes may not operate even if your vehicle starts closing in on the vehicle ahead.

- You are driving your vehicle at the same speed as the vehicle ahead.

- Directly after the TJA has been set.

- Directly after the accelerator pedal is released.

- Another vehicle cuts into the driving lane.

Setting the System Operation conditions Headway control function

The TJA operates when all of the following conditions are met.

- Vehicle speed is 0 km/h (0 mph) to 145 km/h (90 mph)

- The headway control function of the Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) is set to operable (if it was set to inoperable, set it to operable using the personalization function).

- The selector lever is in the D or M position (manual mode).

- The TJA is operating.

- The brake pedal is not depressed.

- The parking brake is released (Electric Parking Brake (EPB) indicator light is turned off).

- There is no problem with the DSC.

- All the doors are closed.

- The driver's seat belt is fastened.


NOTE

- Under the following conditions, the TJA cannot be used when the vehicle speed is 30 km/h (19 mph) or slower.

- The Forward Sensing Camera (FSC) cannot detect target objects (There is problem with the Forward Sensing Camera (FSC) or windshield is dirty).

- There is a problem with the stop hold control function.

- There is a problem with the Electric Parking Brake (EPB).


- The TJA may not launch directly after the engine starts.


Steering assist function

The steering assist function operates when all of the following conditions are met.

- Your vehicle is moving and less than about 56 km/h (35 mph).

- White (yellow) lane lines on both sides are detected and you are driving near the center of the lane, or your vehicle detects a vehicle ahead.

- The steering wheel is not turned sharply.

- The turn signal lever is not operated.

- The headway control function is operating.

- The Off-Road Traction Assist is not operating.

- When Off-road mode is not selected using Mazda intelligent Drive Select (Mi-Drive).


NOTE

- The steering assist function operates so that the vehicle remains near the center of the driving lane, however, depending on conditions such as the road curvature, road slope and undulations, and vehicle speed, the function might not be able to keep the vehicle near the center of the driving lane.

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switch CANCEL switch

switch

switch CANCEL switch

switch

switch CANCEL switch

switch

SET+ switch RES switch SET- switch

SET+ switch RES switch SET- switch

SET+ switch RES switch SET- switch

TJA switch

TJA switch

TJA switch

MRCC switch

MRCC switch

MRCC switch

Setting method


1. Press the TJA switch.

The TJA standby indication (white) turns on. In addition, the TJA display indication is displayed on the multi-information display at the same time.

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(White)


2. Adjust the vehicle speed to the desired setting using the accelerator pedal and press the SET+ switch or SET- switch to start headway control.

The set speed is indicated on the display. At the same time, the TJA standby indication (white) changes to the TJA set indication (green).

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(Green)


3. The headway control is operable when all of the conditions for it to operate are met, or the steering assist function is operable when all of the conditions for it to operate are met.

NOTE

- If a vehicle ahead is detected while traveling at a constant speed, the vehicle-ahead indication is displayed and headway control is performed. Additionally, when a vehicle ahead is no longer detected, the vehicle-ahead indication turns off and the system switches back to travel at constant speed.

- The lowest possible speed which can be set on the TJA is 30 km/h (19 mph).

- Headway control is not possible if the vehicle ahead is driving faster than your vehicle's set speed. Adjust the system to the desired vehicle speed using the accelerator pedal.

- When the ignition is switched OFF, the system status before it was turned off is maintained. For example, if the ignition is switched OFF with the TJA operable, the TJA remains operational the next time the ignition is switched ON.

- When the TJA switch is pressed while the Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) system is operating, the TJA operates. In addition, when the MRCC switch is pressed while the TJA is operating, the Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) system operates.


Changing the set vehicle speed

To accelerate/decelerate using the SET switch

When you press the SET+ switch, the vehicle accelerates and when you press the SET- switch, it decelerates.


Short press

1 km/h (1 mph)

Long press

10 km/h (5 mph)


NOTE

For example, the set vehicle speed is changed by pressing the SET switch four times as follows:

The vehicle speed accelerates or decelerates by 4 km/h (4 mph).

To increase speed using accelerator pedal

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CAUTION

CAUTION

CAUTION

Depress the accelerator pedal and press and release the SET+ switch or SET- switch at the desired speed. If the switch is not operated, the system returns to the set speed after you release your foot from the accelerator pedal.


The WARNINGs and brake control do not operate while the accelerator pedal is depressed.


NOTE

- When accelerating using the SET+ switch while in headway control, the set vehicle speed can be adjusted but acceleration is not possible. If there is no longer a vehicle ahead, acceleration continues until reaching the set vehicle speed. For the set vehicle speed, check the set vehicle speed indication in the display.

- When depressing the accelerator pedal, the inter-vehicle distance indication in the display changes to the white-line indication.

- The setting speed can be changed by operating the SET+ switch or SET- switch during stop hold control.


Changing the distance between vehicles during headway control

The distance-between-vehicles can be set to 4 levels; Long, medium, short, and extremely short distance.

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The distance-between-vehicles is set to a shorter distance by pressing the switch. The distance-between-vehicles is set to a longer distance by pressing the switch.


Distance-between-vehi‐ cles guideline

(at 80 km/h (50 mph) vehicle speed)

Indication on multi-information display


Indication on active driv‐ ing display*1


Type A


Type B


Long (about 50 m (164 ft))


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Distance-between-vehi‐ cles guideline

(at 80 km/h (50 mph) vehicle speed)

Indication on multi-information display


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Indication on active driv‐ ing display*1


Type A


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Type B


Medium (about 40 m (131 ft))


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Short (about 30 m (98 ft))


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Extremely short (about 25 m (82 ft))


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*1 Displays a pop-up image in the active driving display only when the driver operates the switch.

NOTE

- The distance-between-vehicles differs depending on the vehicle speed, and the slower the vehicle speed, the shorter the distance.

- When the ignition is switched to ACC or OFF and then the engine is started again, the system automatically sets the distance-between-vehicles to the previous setting.


The function is temporarily canceled Headway control function

When the following operations are performed, the headway control function is temporarily canceled and the TJA set indication (green) changes to the TJA standby indication (white) at the same time.

- The CANCEL switch is pressed.

- The brake pedal is depressed.

- The parking brake is applied.

- The selector lever is in the P, N, or R position.


Under the following conditions, the TJA cancel indication is displayed in the multi-information display and a single beep sound is heard.

- The DSC has operated.

- The Smart Brake Support (SBS) has operated.

- The Smart City Brake Support [Forward] (SCBS F) or Advanced Smart City Brake Support (Advanced SCBS) has operated.

- When traveling on a downslope for a long period of time.

- There is a problem with the system.

- The engine has stalled.

- Any of the doors is opened.

- The driver's seat belt is unfastened.

- The radar sensor (front) cannot detect target objects (during rain, fog, snow or other inclement weather conditions, or when the radiator grille is dirty).

- The parking brake is automatically applied during stop hold control.

Steering assist function

If any of the following conditions occurs, the steering assist function is temporarily canceled.

- The headway control function is canceled.

- White (yellow) lane lines cannot be detected or a vehicle ahead cannot be recognized.

- Your vehicle speed is more than about 64 km/h (40 mph).

- The accelerator pedal is operated.

- The turn signal lever is operated.

- The Off-Road Traction Assist has operated.

- When Off-road mode is selected using Mazda intelligent Drive Select (Mi-Drive).

- The vehicle is being driven on a sharp curve.

- The width of a lane is excessively narrow or wide.

- The vehicle crosses a lane line.

- The driver takes his/her hands off the steering wheel.

- The steering wheel is operated abruptly.

- There is a problem with the system.

- The temperature in the Forward Sensing Camera (FSC) is too high or too low.

- The windshield around the Forward Sensing Camera (FSC) is foggy.

- The windshield around the Forward Sensing Camera (FSC) is blocked by an obstruction, causing poor forward visibility.


NOTE

- If you take your hands off the steering wheel, a WARNING is indicated on the

multi-information display and the active driving display. Then, if you continue to leave your hands off the steering wheel, a WARNING is indicated on the multi-information display and the active driving display and a WARNING sound is activated.

Multi-information Display


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Active Driving Display


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- If the steering wheel is held lightly, or depending on the road conditions, the system determines that you have released the steering wheel (not holding the steering wheel) even if you are holding it, and an alert is indicated on the multi-information display and the active driving display.


To resume operation

If the TJA is temporarily canceled, it will resume operation at the previously set speed by pressing the RES switch after all of the operation conditions have been met.

NOTE

- If the set speed is not indicated on the display, the system does not operate even if the RES switch is pressed.

- After the operation, the steering assist operation may not operate for a period of 5 seconds at the most until the lane lines are detected or a vehicle ahead is recognized.


Turning off

When the TJA switch is pressed while the TJA is operating, the TJA turns off.


Stop Hold Control

While in headway control using the TJA, your vehicle will stop when a vehicle ahead stops. When the vehicle is stopped and the stop hold control operates, the TJA indicator light turns on.

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NOTE

- If the TJA system is canceled during stop hold control, the vehicle is held in its stopped position. The stop hold control can be canceled by performing one the following actions.

- Press the accelerator pedal and resume driving the vehicle.

- While forcefully depressing the brake, switch the TJA system off.

- The parking brake is automatically applied and the vehicle is held in its stopped position when 10 minutes have elapsed since the stop hold control operated. At this time, the TJA system is canceled.

- The brake lights turn on during stop hold control.


To resume driving

After the vehicle ahead starts moving while your vehicle is stopped under stop hold control, press the RES switch or depress the accelerator pedal to cancel the stop hold control and start driving.

NOTE

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- When you resume driving by pressing the RES switch, your vehicle does not start moving until the distance between your vehicle and the vehicle ahead lengthens to the specified distance or farther.

- If the TJA is temporarily canceled during stop hold control, you cannot resume driving by pressing the RES switch when there are no vehicles in front of your vehicle. Depress the accelerator pedal and resume driving the vehicle.

- If the vehicle ahead starts moving within 3 seconds after your vehicle is stopped by the stop hold control, headway control will resume even if you do not resume driving your vehicle, such as by depressing the accelerator pedal.


Resume driving information

If you do not resume driving within a few seconds after the vehicle ahead starts moving, the multi-information display vehicle-ahead indication flashes to urge the driver to resume driving.


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Lane-keep Assist System (LAS) & Lane Departure WARNING System (LDWS)*

Lane-keep Assist System (LAS) & Lane Departure WARNING System (LDWS)*

Lane-keep Assist System (LAS) & Lane Departure WARNING System (LDWS)*

Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function)

(Page 123)

The MRCC with Stop & Go function system is designed to maintain headway control*1 with a vehicle ahead according to your vehicle's speed using...

Lane-keep Assist System (LAS) & Lane Departure Warning System (LDWS)

(Page 125)

The LAS & LDWS alerts the driver that the vehicle may be deviating from its lane and it provides steering assistance to help the driver stay withi

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