A computer-implemented traffic message encoding and decoding method, the message to be transmitted from a transmitter to a receiver, providing a description of a road segment using locations stored in a geographic database, the description of the road segment being output to a user, the road segment being identified in the geographic database on the basis of location reference core points (100a-100d) allowing a unique identification of said road segment in the geographic database using a Dynamic Location references technique according to ISO 17572-3, the method comprising the steps of: - encoding and decoding two first location reference points (20, 30) with which a greater road section including said road segment is described, wherein one of the two first location reference points (20, 30) corresponds to a geographic object located at a first end of said greater road section and the other of the two first location reference points corresponds to a geographic object located at a second end of said greater road section, - and two second location reference points (21, 22) with which the road segment within said greater road section is described in more detail, wherein one of the two second location reference points (21, 22) corresponds to a geographic object located at a first end of said road segment and the other of the two second location reference points (21, 22) corresponds to a geographic object located at a second end of said road segment, the road segment being described using the first two location reference points (20, 30) and the second two location reference points (21, 22), wherein the two first and two second location reference points (20, 30, 21, 22) are location reference extension points which are added to the location reference core points and which are used for the description of the road segment to be output to a user, wherein the described road segment is a road segment where a traffic event has occurred the description of the road segment being used to inform the user about the traffic event on said road segment. - encoding and decoding two first location reference points (20, 30) with which a greater road section including said road segment is described, wherein one of the two first location reference points (20, 30) corresponds to a geographic object located at a first end of said greater road section and the other of the two first location reference points corresponds to a geographic object located at a second end of said greater road section, - and two second location reference points (21, 22) with which the road segment within said greater road section is described in more detail, wherein one of the two second location reference points (21, 22) corresponds to a geographic object located at a first end of said road segment and the other of the two second location reference points (21, 22) corresponds to a geographic object located at a second end of said road segment, the road segment being described using the first two location reference points (20, 30) and the second two location reference points (21, 22), wherein the two first and two second location reference points (20, 30, 21, 22) are location reference extension points which are added to the location reference core points and which are used for the description of the road segment to be output to a user, wherein the described road segment is a road segment where a traffic event has occurred the description of the road segment being used to inform the user about the traffic event on said road segment.