Mazda 3 Owner's Manual page 259

NOTE
The Mazda Radar Cruise Control (MRCC) system operates when all of the following
conditions are met.
The vehicle speed is as follows:
(European models)
About 30 km/h (19 mph) to 200 km/h (124 mph)
(Except European models)
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) indicator light (amber) does not illuminate.
The Dynamic Stability Control (DSC) is operating normally.
(Manual transaxle)
The shift lever is in a position other than reverse (R) or neutral (N).
The clutch pedal is not depressed.
(Automatic transaxle)
The selector lever is in the drive (D) position or manual (M) position (manual
mode).
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 travelling 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.
Mazda Radar Cruise Control (MRCC)
When Driving
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