Yeah you are right, every node has 4 pointers that may or may not lead to a different node (depending of the street or avenue that represents, it doesn't necessarily means it is linked to a cardinal direction is just to represent double way roads) so I think I am basically doing a Graph. I talked about an array because in my university classes we worked with linked lists and we basically had a main pointer that pointed to a node which leads to NULL to the back and to other node to the front (if is not circular). We never stored the objects/nodes in any array, but I think it could be better if I store them on it and keep a directory of nodes.