Mazda CX-5 2018 Owner's Manual page 285

The vehicle speed exceeds the displayed speed limit sign by 30 km/h (19 mph) or more
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after a certain period of time has elapsed since the speed limit sign was displayed.
(Except when there is information for the speed limit sign in the navigation system)
Do not enter signs
A do not enter sign is displayed when all of the following conditions are met.
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The vehicle speed is about 80 km/h (50 mph) or slower.
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The Forward Sensing Camera (FSC) recognises a do not enter sign as a sign targeted
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for your vehicle and the vehicle passes it.
When the Forward Sensing Camera (FSC) recognises the do not enter sign and a certain
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period of time has elapsed since the vehicle passed the sign, display of the do not enter
sign stops.
Passing prohibited sign (windscreen type)
A passing prohibited sign is displayed when all of the following conditions are met.
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The vehicle speed is about 1 km/h (0.6 mph) or more.
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The Forward Sensing Camera (FSC) recognises a passing prohibited sign as a sign
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targeted for your vehicle and the vehicle passes it.
In the following cases, the display of the passing prohibited sign stops.
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The Forward Sensing Camera (FSC) recognises a passing prohibited sign and you
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drive a certain distance after passing the sign.
You have changed vehicle lanes.
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