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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.
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 k eeping the vehicle within the lane lines. If lane
lines are not detected, the function provides th e driver driving assistance in keeping the
vehicle along the motion path with the vehicle ahead.
WA R N I N G
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 acco rding 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. Add\
itionally, the
system might be unable to decelerate suffic iently 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 us e 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 high ways (Driving under these conditions using
the TJA is not possible.)
Roads with sharp curves and where vehicle tr affic is heavy with insufficient space between
vehicles, or roads where frequent and repet itive acceleration and deceleration occur
(Driving under these conditions using the TJA is not possible).
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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 h eadway 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, th e function provides the driver driving assistance
in keeping the vehicle along the motion path with the vehicle ahead.
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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.
Displayed on the basic display.
*1: *1
*1
Instrument Cluster (Type A) Instrument Cluster (Type B)
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▼Traffic Jam Assist (TJA) Display Indication
The TJA setting status and operation conditi
ons are indicated on the multi-information
display and the active driving display.
TJA distance
between vehicle
display
TJA set
vehicle
speed
Vehicle ahead display
Vehicle ahead display
TJA distance
between vehicle
display
TJA set
vehicle
speed
TJA
distance
between
vehicle
display
TJA set vehicle speed
Vehicle ahead display
Instrument Cluster (Type A) Instrument Cluster (Type B)
Vehicle
ahead
display
Displayed on the basic display.
*1: *1
*1 Active driving display
Multi-information display
Steering assist function display
When the steering assist function operates , the steering assist operation display on the
display changes from white to green.
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Multi-information display
*1*1
Displayed on the basic display.
*1: Instrument Cluster (Type A)
Instrument Cluster (Type B)
Steering assist operation display Steering assist operation display
Active driving display
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
*1
*1
Instrument Cluster (Type A)Instrument Cluster (Type B)
Steering assist operation
display (white)
Displayed on the basic display.
*1: Steering assist operation
display (white)
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Active (vehicle ahead)
*1*1
Instrument Cluster (Type A)Instrument Cluster (Type B)
Steering assist operation
display (green)
Displayed on the basic display.
*1: Steering assist operation
display (green)
Active (lane line)
*1
*1
Instrument Cluster (Type A)Instrument Cluster (Type B)
Steering assist operation
display (green)
Displayed on the basic display.
*1: 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 di
splay. Always verify the safety of the
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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 ope rates 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.
Setting method
RES switch
SET- switch
MRCC switch
TJA switch
CANCEL switch
SET+ switch
switch
switch
1. Press the TJA switch.
The TJA standby indication (white) turns on. In addition, the TJA display indication is
displayed on the multi-informati on display at the same time.
(White)
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2. Adjust the vehicle speed to the desired setting using the accelerator pedal and press theSET+ 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 TJ A set indication (green).
(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 travel ing 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 syst em 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)
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