The arrows will flash in unison with the exterior turn signal, when using the turn signal lever.
See also:
Containing running costs and pollution
Some suggestions which may help you to keep the running costs of the vehicle
down and lower the amount of toxic emissions released into the atmosphere are given
below. ...
Engine codes - bodywork versions
...
CO2 emission at exhaust
The CO2 emission levels at the exhaust given in the following table refer to
combined consumption.
...