Speed memorisation
Used only with the speed limiter and programmable cruise control, this function allows speed thresholds to be stored, which are then suggested when setting up these two systems.
Several speed thresholds can be stored in the system for each of these systems.
By default, speed thresholds are already stored.
For safety reasons, the driver must always carry out these speed threshold changes while the vehicle is stationary.
Changing a speed threshold
Activating/deactivating, as well as selecting and changing speed thresholds, is done via the Drive / Vehicle menu on the touchscreen.
"MEM" button

This button is used to select a stored speed threshold for use with the speed limiter or programmable cruise control.
For more information on the Speed limiter or Cruise control, refer to the relevant section.
Highway Driver Assist
Only available on versions with automatic gearbox.
This system automatically controls speed and corrects the vehicle's trajectory by combining the Adaptive cruise control with Stop & Go function and the Lane keeping assist system.
Both of these functions must be activated and operating.
For more information on the Adaptive cruise control and Lane keeping assist systems, refer to the relevant sections.
The system assists the driver by acting on steering, acceleration and braking within the physical limits and capabilities of the vehicle. Certain road infrastructure elements or surrounding vehicles may be misdetected or misinterpreted by the camera and radar, which may lead to an unexpected change of direction, a lack of steering correction and/or inappropriate acceleration or braking management.
Designed mainly for driving on expressways and motorways, this system only works with moving vehicles travelling in the same direction as your vehicle.
Test yourself
A quick Citroen C5 Aircross quiz: every answer comes with an explanation and a link to the manual page.