A device can receive a request to determine a set of navigational directions, and can obtain a set of traffic objects associated with a first map layer. The set of traffic objects can include nodes to identify one or more geographic locations and one or more links to identify one or more geographic areas between the nodes. The device can determine a shortest-path tree by analyzing the set of traffic objects, the shortest-path tree being associated with a static data structure. The device can generate a dynamic data structure that includes the shortest-path tree and a set of additional traffic objects associated with a second map layer. The device can determine a shortest path by analyzing traffic objects associated with the shortest-path tree and the set of additional traffic objects. The device can provide the set of navigational directions to indicate the shortest path.