--- title: "ADAS, DMS and BSD Explained: What Each Fleet Camera Alert Does" author: "Kumar Saurabh" published: "2026-10-01" updated: "2026-10-01" url: "https://dashcamforcars.com/adas-dms-bsd-explained-fleet-camera-alerts/" --- # ADAS, DMS and BSD Explained: What Each Fleet Camera Alert Does ADAS watches the road, DMS watches the driver and BSD watches the blind spot. Each needs its own camera, and our devices differ in the alerts they give. ## Key takeaways - ADAS uses a road-facing camera to warn of forward collisions, lane departures, pedestrians and short following distance. - DMS uses an infrared cabin camera to detect fatigue and distraction; some devices add phone use, smoking and seatbelt checks. - BSD uses side cameras to detect vehicles, cyclists and pedestrians alongside a large vehicle. - Alerts depend on speed: the D9 alerts above 30 km/h, and the ADAS Camera detects pedestrians below 50 km/h. - The alert sounds in the cab, and the clip goes to the fleet platform for review. ADAS, DMS and BSD are three AI alerts on fleet cameras, each with its own camera view. ADAS (advanced driver assistance system) watches the road ahead. DMS (driver monitoring system, also written DSM) watches the driver. BSD (blind spot detection) watches the side of the vehicle. Each warns the driver in the cab, then sends the event to the fleet platform. ## ADAS: the road ahead An ADAS camera faces forward from the top of the windscreen. Its software measures lanes, vehicles and people in the picture and gives these warnings: - **Forward collision warning (FCW).** The gap to the vehicle ahead is closing too fast. - **Lane departure warning (LDW).** The vehicle drifts across a lane marking. - **Pedestrian collision warning (PCW).** A person is detected in the vehicle's path. - **Headway monitoring (HMW).** The following distance, measured in seconds, is too short. - **Front vehicle start.** The vehicle ahead has moved off and yours has not. Fleets fit ADAS to buses, trucks and delivery vehicles for the forward-collision and lane-departure warnings, and use the logged events in driver coaching. ## DMS: the driver A DMS camera faces the driver and uses infrared light, so it works at night. It follows the eyes, the mouth and the head position. What it alerts on depends on the device: | Device | DMS alerts | |---|---| | D9 | Yawning, closed eyes, distraction, smoking, blocked camera | | WD02 (optional) | Yawning, closed eyes, phone use, smoking, looking away, seatbelt, blocked camera | | WD10 and WD11 | Closed eyes, yawning, distraction, phone calls, smoking, face lost, blocked camera | | WD12 | Fatigue, distraction, smoking | | S202 (optional) | Fatigue, smoking, blocked camera, unsafe driving behaviour | | DSM Camera | Closed eyes, head nodding | | AHD005 | Drowsiness, yawning, closed eyes, distraction, hat or helmet | ## BSD: the blind spot A BSD camera is mounted on the side of a truck or a bus and looks along the body. It detects vehicles, cyclists and pedestrians in the zone the mirrors do not cover, and the recorder raises a left or right blind-zone alarm. Our [BSD Camera](/product/bsd-camera/) records 1920 × 1080, and its viewing angle adjusts from 120° to 170° to suit the length of the vehicle. Fit the side furthest from the driver first. ## What the three have in common | | ADAS | DMS | BSD | |---|---|---|---| | Camera faces | The road ahead | The driver | The side of the vehicle | | Mounted | Top of the windscreen, centred | Dashboard or A-pillar; in the windscreen unit on the D9 | Vehicle body | | Covers | Rear-end and lane incidents | Fatigue and distraction | Side-swipes, cyclists | | Needs | Calibration to the lane and the horizon | A clear view of the face | The detection zone set to the vehicle | Three practical points: 1. **Calibration decides accuracy.** After mounting, the camera has to be set up for its height and angle. A badly aimed camera gives false alarms, and drivers soon ignore it. 2. **Alerts depend on speed, in both directions.** On the D9, ADAS and DMS alerts are active above 30 km/h, so parking manoeuvres do not trigger them. On the ADAS Camera, lane-departure warning starts at a speed you set, and pedestrian detection works below 50 km/h. 3. **The clip matters as much as the beep.** The warning helps the driver in the moment; the uploaded clip lets a manager review the event and coach on what actually happened. ## Which of our products have what | Product | ADAS | DMS | BSD | |---|---|---|---| | [D9](/product/d9-dual-lens-dashcam/) dashcam | Yes | Yes | No | | [WD02](/product/wd02-ai-dashcam-with-gps/) dashcam | Optional | Optional | Optional | | [D3](/product/d3-4g-mini-dashcam/) dashcam | Yes | No | No | | [S202](/product/s202-4g-ai-camera/) camera | No | Optional | Optional, in place of DMS | | [WD10](/product/wd10-mdvr/) and [WD11](/product/wd11-mdvr/) recorders | With an [ADAS Camera](/product/adas-camera/) | With a [DSM camera](/product/dsm-camera/) | With up to two BSD cameras | | [WD12](/product/wd12-mini-dual-sd-card-mobile-dvr/) recorder | With a road-facing camera | With a driver-facing camera | Optional | Short definitions of these and related terms are in the [glossary](/glossary/). ## FAQ ### What is the difference between ADAS and DMS? ADAS watches the road ahead and warns of collisions, lane departures and pedestrians. DMS watches the driver and warns of fatigue and distraction. They use separate camera views. ### Is DMS the same as DSM? Yes. DMS (driver monitoring system) and DSM (driver status monitoring) are two names for the same function: a cabin camera that detects fatigue and distraction. ### Do ADAS alerts work at low speed? It depends on the alert. On the D9, alerts are active above 30 km/h, so parking and slow manoeuvres do not trigger them. Pedestrian detection on the ADAS Camera works the other way: it is active below 50 km/h. ### Does a dashcam with ADAS brake the vehicle? No. A fleet dashcam only warns the driver and records the event. It does not control the brakes or the steering. By Kumar Saurabh, Head of Overseas Business, SKYWONDER.