BMW 3: Fatigue alert

General information

The system can detect decreasing alertness or fatigue of the driver during long, monotonous trips, for instance on highways. In this situation, it is recommended that the driver takes a break.

Safety information

Warning The system cannot serve as a substitute for the driver's personal judgment in assessing one's physical state. An increasing lack of alertness or fatigue may not be detected or not be detected in time. There is a risk of accident. Make sure that the driver is rested and alert. Adjust driving style to traffic conditions.

Function

The system is switched on each time drive-ready state is switched on.

After travel has begun, the system monitors certain aspects of the driver's behavior, so that decreasing alertness or fatigue can be detected.

This procedure takes the following criteria into account:

• Personal driving style, for instance steering behavior.
• Driving conditions, for instance time, length of trip.
• Depending on the equipment: attention of the driver through the Driver Attention Camera.

Starting at approx. 43 mph/70 km/h, the system is active and can also display a recommendation to take a break.

Break recommendation

Adjusting

The fatigue alert is active automatically with each switching on of drive-ready state and can thus display a break recommendation.

The break recommendation can also be switched on or off and adjusted via iDrive.

Via iDrive:

1. "CAR".

2. "Settings".

3. "General settings".

4. "Fatigue and Focus Alert".

5. Select the desired setting:

• "Standard": the break recommendation is made with a defined value.
• "Sensitive": the break recommendation is issued earlier.
• "Off": no break recommendation is made.

Display

If the driver becomes less alert or fatigued, a message is displayed in the Control Display with the recommendation to take a break.

During the display, various settings can be selected.

After a break, another recommendation to take a break cannot be displayed until after approximately 45 minutes.

System limits

The function may be limited in the following situations and may issue an incorrect warning or no warning at all:

• When the clock is set incorrectly.
• When the vehicle speed is mainly below about 43 mph/70 km/h.
• With a sporty driving style, such as during rapid acceleration or when cornering fast.
• In active driving situations, such as when changing lanes frequently.
• When the road surface is poor.
• In the event of strong side winds.

The system is reset approx. 45 minutes after parking the vehicle, for instance in the case of a break during longer trips on highways.

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