Resources:

The Vision On Wheels project utilizes multiple modalities to obtain information about the occupants of a vehicle
 

Components:

Multiple rectilinear cameras provide views of the vehicle's occupants and their surroundings inside the vehicle.  Cameras placed outside the vehicle allow for computational analysis of street signs, traffic flow, lane detection, and obstacle avoidance.
 
 

Omni-Directional Video Sensors (ODVS) provide a 360 degree field of view.  The wide view provides good coverage of the entire scene.  When placed inside the vehicle, all passengers can be simultaneously observed.  If mounted on the roof, ODVS provide a view of traffic around the vehicle in all directions.
 
 

Thermal sensors pointed at the driver are used when the ambient light is too low for normal image sensors to provide adequate information.
 
 

The trinocular stereo system provides a three-dimensional model of the driver.  This is useful for determining body position of the driver relative to the steering wheel.