The DMS Sensor enhances your Driver•i device with an inward-facing camera, infrared LEDs, and night vision to detect driver drowsiness more accurately — including at night and through many sunglasses.
It tracks six physical and behavioral signs of fatigue: extended or intermittent eye closures, slow or excessive blinking, head nodding, and lane deviation. These are evaluated individually and together to determine alert severity.
Alert Levels
The system uses two levels — moderate and severe — so drivers get an early nudge before things escalate, and fleet managers are notified when it’s serious.
In-cab alerts play an audio message (“Please Stay Alert”) while the vehicle is moving above 10 mph. Moderate alerts are limited to once every 15 minutes to avoid fatigue. Severe alerts can fire more frequently, with a configurable minimum of 30 seconds.
Dashboard alerts appear under Driver Drowsiness in the fleet dashboard. Moderate alerts surface after two moderate in-cab alerts within 60 minutes of driving. Severe dashboard alerts are generated every time a severe in-cab alert fires.
Both alert types can be enabled or disabled from Provisioning & Configurations > Configurations > In-Cab Audio Alerts.
Video Availability
DMS Sensor video is only recorded for Driver Drowsiness alerts. If a DMS alert was triggered during a given minute, that video will be visible in Event Access — but direct fetching and video stitching are not supported.
Additional Information
Please visit Driver Drowsiness with DMS Sensor (requires a Driveri login) for additional information.