77 dB (A) in Germany. Larger mufers will be needed to comply, which means
this system may well become quite popular.
15.7.4 Auto dimming mirrors
An automatic dimming function is achieved by the use of electro-chromatic
mirror glass. A control unit and forwards and backwards directed light sensors
are used. The forward facing light sensor monitors the ambient light level at
the front of the vehicle; the rearward facing light sensor monitors the light level
coming from the rear of the vehicle. If the light falling in from the rear is higher
than that from the front, the interior rear view mirror is automatically dimmed.
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