Even some of the Leaf's exterior components serve dual roles. The LED
headlights not only illuminate the road using half the energy of
halogens; their winged shape actually directs air away from the side
mirrors (an innovation Nissan is currently attempting to patent) to
reduce interior noise, which is whisper-quiet even at highway speeds.
The Leaf is quieter than most luxury cars inside the cabin—so quiet,
Nissan had to engineer new windshield-wiper motors. Apparently, the
drone of internal combustion engines covers the noise made by normal
wiper motors.
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