Information such as speed, heading, GPS difference equipment can also be the vehicle of various sensors (such as log, speed meter, magnetic compass, etc.) for the calibration work.

The passenger took a series of between eight to 10 sound level measurements at various points in the journey from the position of the driver's left ear, at various speeds.

With the eye tracker, the eye fixation and fixation time distribution in different speeds are analyzed when the car passes through traffic signs with different font height.