Lexus GS450h Manual page 15

Lexus Hybrid Drive Operation (Continued)
Vehicle Proximity Notification System
A new feature on the 2013 GS450h is the vehicle proximity notification system
that emits a sound when the vehicle is driven using only the electric motor at
speeds less than 12 mph. The sound is intended to notify pedestrians that the
vehicle is approaching.
Vehicle Proximity Notification System
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