Honda RDX Owner's Manual page 304

Driving with the Paddle Shifters
The transmission control system
monitors the accelerator pedal use
and your driving conditions. When
you press the accelerator pedal as in
normal driving, the system judges
that you are driving at a constant
cruising speed without using the
paddle shifters. Under these
conditions, D-paddle shift mode is
canceled, and the transmission
automatically returns to drive mode
(D).
When the transmission returns to
drive mode (D), the displayed gear
number goes out.
The transmission remains in the
selected gear if you do not accelerate.
Each time you pull either paddle
shifter, the transmission shifts one
gear up or down. If you want to shift
up or down more than two gears, pull
the paddle shifter twice, pause, and
then pull it again.
298
The automatic transmission will not
allow you to shift up or down if:
You downshift before the engine
speed falls below the upper limit of
the lower gear.
If you try to do this, the gear
position indicator will flash the
number of the lower gear several
times, then return to a higher gear.
You upshift before the engine
speed rises above the lower limit
of the higher gear.
You press both paddle shifters at
the same time.
You press one of the two paddle
shifters with another paddle
shifter being pressed.
The transmission downshifts to first
gear and returns to drive mode (D)
when the vehicle comes to a
complete stop or the vehicle speed is
about 6 mph (10 km/h).
If there is a problem in the
transmission while you are driving
with the paddle shifters, the D
indicator flashes, the D-paddle shift
mode is canceled, and the
transmission returns to drive mode
(D).