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Here is the support page for the XC40 2020 (Late) manual.
https://www.volvocars.com/uk/support/manuals/xc40/2020-late/driver-support/driver-alert-control/driver-alert-control
It is as I expected detecting your lane keeping abilities using the forward facing camera. It is not a driver facing camera. I don't expect this to change with the electric model when it launches in the spring, I do
Driver Alert Control
Updated 11/13/2019
The Driver Alert Control (DAC) function is intended to help make the driver aware that he or she is starting to drive less consistently, e.g. if the driver becomes distracted or starts to fall asleep.
The objective for DAC is to detect slowly deteriorating driving ability and it is primarily intended for major roads. The function is not intended for city traffic.
The function is activated when speed exceeds 65 km/h (40 mph) and remains active as long as the speed is over 60 km/h (37 mph).
Driver Alert Control, the position of the car in the lane
DAC reads the position of the car in the lane.
A camera detects the edge markings painted on the carriageway and compares the alignment of the road with the driver’s steering wheel movements.
P5-1507-Driver Alert Control, the car is being driven erratically in the lane
The car is being driven erratically in the lane.
P5-1507-Driver Alert Control, time to take a brake symbol
If driving behaviour becomes noticeably inconsistent, the driver is alerted by this symbol in the driver display, combined with an acoustic signal and the text message Time to take a break.
If the car is equipped with Sensus Navigation* and has the function Rest Stop Guidance activated, suggestions for an appropriate place for a break are also displayed.
The warning is repeated after a time if driving behaviour has not improved.
Warning
Driver Alert Control should not be used to extend a period of driving. The driver should instead plan for breaks at regular intervals and make sure they are well rested.
Warning
An alarm from Driver Alert Control should be taken very seriously, as a sleepy driver is often not aware of his/her own condition.
If the alarm sounds or you feel fatigued:
Stop the car safely as soon as possible and rest.
Studies have shown that it is just as dangerous to drive while tired as it is to drive under the influence of alcohol or other stimulants.
Warning
The function is supplementary driver support intended to facilitate driving and make it safer – it cannot handle all situations in all traffic, weather and road conditions.
The driver is advised to read all sections in the Owner's Manual that relate to this function to learn about factors such as its limitations and what the driver should be aware of before using the system.
Driver support functions are not a substitute for the driver's attention and judgement. The driver is always responsible for ensuring the car is driven in a safe manner, at the appropriate speed, with an approp
TLS - I think 18 months is a long time in terms of DMS. The 2020 model could be very different.
https://www.volvocars.com/uk/support/manuals/v60/2018/driver-support/driver-alert-system/driver-alert-system
It is "watching" your performances via the lane markings using a forward facing camera that is a key part of the LKA. I imagine it keeps track of how smooth your centering ability is, or are you starting to make less frequent but sharper corrections. So a step up from just a steering input monitor.
'watches'....using the eyes as a conduit or some other 'non-eye' method?
TLS - The words do seem to split Lane assist from Drowsy driver
What's XC40’s safety equipment and crash ratings?
In addition to the things like airbags and seat belts, standard safety equipment on the 2020 Volvo XC40 includes
front and rear collision warning,
automatic emergency braking,
a driver alert system that watches for drowsy driving,
lane keeping assist and road sign information.
Bauchsapt
No the driver alert system is connected to the lane keeping assistant. If you are driving and move out of your lane or are not staying in the centre of the lane it warns you. But can only work if the lanes are clearly marked.
https://www.google.co.uk/amp/s/www.autoblog.com/amp/2020/01/09/2020-volvo-xc40-review/
So is the Volvo xc40 out yet because on that article it says that this model has “a driver alert system that watches for drowsy driving”