Lexus RX 450h 2014 Owner's Manual page 186

2-1. Driving procedures
CAUTION
Caution while driving
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When driving in EV drive mode no engine noise is made. As such, pedestrians,
people riding bicycles or other people and vehicles in the surrounding area may not
be aware of the vehicle starting off or approaching them. Therefore, take extra care
while driving even if the Vehicle Proximity Notification System is active.
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