Mazda CX-9 2016 Owner's Manual page 256

When Driving
i-ACTIVSENSE
NOTE
The Mazda Radar Cruise Control (MRCC) system operates when all of the following
conditions are met.
The vehicle speed is about 30 km/h (19 mph) to 145 km/h (90 mph).
The Mazda Radar Cruise Control (MRCC) system is turned on.
The parking brake is not applied.
The Smart Brake Support (SBS) is not malfunctioning.
The Dynamic Stability Control (DSC) is operating normally.
The selector lever is in the drive (D) position or manual (M) position (manual mode).
All doors are closed.
The driver's seat belt is fastened.
In the following cases, the warnings may not activate even if your vehicle starts closing in
on the vehicle ahead.
You are driving at the same speed as the vehicle ahead.
Directly after the Mazda Radar Cruise Control (MRCC) system has been set.
When the accelerator pedal is depressed or directly after the accelerator pedal is
released.
Another vehicle cuts into the driving lane.
The following are not detected 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.
During headway control travel, do not set the system on two-wheeled vehicles such as
motorcycles and bicycles.
Do not use the Mazda Radar Cruise Control (MRCC) system under conditions in which
the close proximity warnings are frequently activated.
During headway control travel, the system accelerates and decelerates your vehicle in
conjunction with the speed of the vehicle ahead. However, if it is necessary to accelerate
for a lane change or if 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 Mazda Radar Cruise Control (MRCC) system is in use, it does not cancel
even if the selector lever is operated and any intended engine braking will not occur. If
deceleration is required, lower the vehicle speed setting or depress the brake pedal.
The brake lights are illuminated while the Mazda Radar Cruise Control (MRCC)
automatic braking is operating.
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