Anti-Fatigue Systems for buses

An Anti-Fatigue System (AFS) is an onboard system installed on vehicles to detect signs of driver fatigue while driving. In the automotive industry, Anti-Fatigue Systems are a form of driver-assistance features which are broadly categorized as Vehicle Safety Technology, a classification which also includes Advanced Driver Assistance Systems (ADAS).

On Singapore buses, AFS systems are installed on the dashboard of the bus, comprising a camera unit and an infrared illuminator. Tactile feedback is delivered to the driver via a vibration motor attached to the driver’s seat when loss of concentration is detected.

The Land Transport Authority (LTA) is responsible for bus procurement and their specifications since the start of the Bus Contracting Model (BCM). The LTA made AFS systems a requirement for buses procured starting from late-2017.


When the MAN Lion’s City DD Mock-up Bus (SG5999Z) was first exhibited to the public, it bore an anti-fatigue system supplied by Guardian Seeing Machines. A similar AFS is also featured on the MAN Lion’s City SD Concept Bus (SG4002G).

AFS Systems in use

Guardian Seeing Machines

Model Guardian
Functionality Fatigue detection and alert system with incident reporting capability (unknown)
Buses SG5999Z, SG4002G, MAN A22 (Euro 6)MAN A95 (Euro 6)

The Guardian Anti-Fatigue System, supplied by Australian company Seeing Machines, is an intelligent driver safety system that uses in-cab sensors to monitor in real time the driver’s levels of fatigue and distraction. Face- and gaze-tracking algorithms measure the driver’s head position and eye closure and, when safety parameters are exceeded, audio alarms and seat vibration are immediately activated.

The system comes in the form of a small dash-mounted camera. Small infrared illuminator units mounted on the dashboard (near the camera unit) emit infrared light, enabling the system to work in the dark and even when the driver is wearing sunglasses. The system is also capable of sending fatigue incident reports to the Operations Control Centre, but it is not known whether local bus operators are using the feature.

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