CITROEN Grand C4 PICASSO Owner's Handbook Manual page 158

Driving
Check that the symbol displayed in the
instrument panel agrees with the position
engaged.
Progressively release the brake pedal.
If the parking brake is release, the vehicle
moves off.
If the parking brake is applied and
automatic operation is activated, accelerate
away.
Never press the accelerator and brake
pedals at the same time. Braking and
acceleration should be done only with
the right foot. Pressing both pedals
together risks damaging the gearbox.
156
When the engine is running at idle,
brakes releases, if position R, D or M is
selected, the vehicle will move even if
the accelerator is not pressed.
Never leave children unsupervised in
the vehicle when the engine is running.
When carrying out a maintenance
operation with the engine running, apply
the parking brake and select position P . P
Never select position N when driving.
If position N is engaged in error when
moving, allow the engine to idle, then
engage position D to accelerate.
Never select position P or R unless the
vehicle is a a complete stop with the
brake applied.
When you want to engage reverse, to
avoid jolt, do not accelerate immediately
after engaging R.
Changing into position R is
accompanied by an audible signal.