CITROËN 2014 C4 Picasso Handbook page 384

05 TRAFFIC
Diverting from a route
Press on Navigation to display the primary
page then go to the secondary page.
select "Traffic messages".
select "Diversion".
Select the diversion distance by pressing + or -.
382
select "Recalculate route". The route
will be modified in time and distance.
select "Confirm".
The route may be diverted following the reception of a traffic
information message.