A method of routing data packets (P) between a source node (S) and a target node (C) in an ad hoc network comprising mobile nodes (1-14) that can be located and moving on traffic routes (L1, L2, L3, C1, C2, C3) of a particular geographical network (10) forming between them a plurality of intersections (I1-I6). This method comprises a destination intersection selection step in which a carrier node (S) of the packets (P) selects a destination intersection (12) from neighbor intersections and according to traffic conditions; a step of seeking one or more neighbor mobile nodes (1) of the packet carrier node nearer the selected destination intersection (12) than the carrier node; and, if one or more neighbor mobile nodes (1) are found, a step of transferring the packets (P) from the packet carrier node (S) to the neighbor node (1) that has been found, so as to route the data packets to the selected destination intersection.