WARNING SYSTEM

A warning system (2) for a vehicle which system comprises at least one viewing device (4) with a viewing surface (6) adapted to presenting objects (8) which are in the vicinity of the vehicle a processing unit (10) adapted to receiving one or more sensor signals (12) from one or more sensors which are adapted to measuring one or more predetermined parameters of objects in the vehicle s vicinity and using said parameters as a basis for determining whether there is an object in a predefined overtaking zone (22). The warning system comprises at least one indicating means (14) situated close to said viewing device (4) and adapted to generating at least one overtaking indication (16) for presentation on or close to the viewing surface (6) of the viewing device in response to a display signal (18) generated by said processing unit (10) and the warning system is adapted to being in either of two overtaking states comprising a first state and a second state such that the first state applies when at least one object (8) is in said overtaking zone and the second state applies when there are no objects in said overtaking zone and said overtaking indication (16) is adapted to changing on the basis of said overtaking states.