The armrest is located in the center of the rear seat. Pull the armrest down from the seatback to use it.
You will find cup holders on the center armrest.
Hyundai Tucson (LM) 2010-2015 Owners Manual: Occupant Classification System (OCS)
Your vehicle is equipped with an Occupant Classification System (OCS) in the
front passenger's seat.
The OCS is designed to detect the presence of a properly-seated front passenger
and determine if the passenger's front air bag should be enabled (may inflate) or
not. The driver's front ai ...
Hyundai Tucson (LM) 2010-2015 Owners Manual: Key ignition switch
WARNING
NEVER turn the ignition switch to the LOCK or ACC position while the vehicle
is in motion except in an emergency. This will result in the engine turning off
and loss of power assist for the steering and brake systems. This may lead to loss
of directional control and braking functi ...