Opel 2015 Astra Owner's Manual page 189

Press E; the current setting is shown
in the DIC. Press E again to change
the following distance. The setting is
also displayed in the top line of the
DIC.
The selected following distance is
indicated by filled distance bars in the
adaptive cruise control page.
Note that the following distance
setting is shared with the sensitivity
setting of forward collision alert.
Example: If setting 3 (far) is selected,
then the driver is warned sooner
before a possible collision, also if
adaptive cruise control is inactive or
switched off.
Driving and operating
9 Warning
The driver accepts full
responsibility for the appropriate
following distance based on traffic,
weather and visibility conditions.
Following distance must be
adjusted or the system switched
off when required by the prevailing
conditions.
Detecting the vehicle ahead
187