State Road 13, is an IB-class road, located in northern Serbia, connecting Horgoš with Belgrade. It is located in Vojvodina and City of Belgrade. Before the new road categorization regulation given in 2013, the route wore the following names: O 10, M 22.1, P 119, P 111, P 112, M 24, M 3 and M 24.1 / 102, 11, and 104. Wikipedia