CITROEN DS3 Owner's Handbook Manual page 170

Automatic operation
Select position D for automatic changing
of the four gears.
The gearbox then operates in auto-adaptive
mode, without any intervention on the part
of the driver. It continuously selects the most
suitable gear according to the style of driving,
the profile of the road and the load in the
vehicle.
For maximum acceleration without touching
the lever, press the accelerator pedal down
fully (kick down). The gearbox changes down
automatically or maintains the gear selected
until the maximum engine speed is reached.
On braking, the gearbox changes down
automatically to provide efficient engine
braking.
If you release the accelerator sharply, the
gearbox will not change to a higher gear for
safety reasons.
Never select position N while the
vehicle is moving.
Never select positions P or R unless
the vehicle is completely stationary.
Sport and snow
programmes
These two special programmes supplement the
automatic operation in very specific conditions
of use.
Sport programme "S"
Press button "S" , after starting the engine.
The gearbox automatically favours a dynamic
style of driving.
S appears on the instrument panel.
Snow programme " "
Press button " ", after starting the engine.
The gearbox adapts to driving on slippery
roads.
This programme improves starting and drive
when traction is poor.
appears on the instrument panel.
Return to automatic
operation
At any time, press the button selected
again to quit the programme engaged and
return to auto-adaptive mode.