 Analysis showed that the ground traffic will be relieved of 3,120 vehicles per hour, which will result in the reduction of the vehicle number in downtown by 10–15%, and driving time and carbon-dioxide emission by 10%.At Savamala entry point, there will be constructed a roundabout in "Karađorđeva" street to accommodate both the tunnel and the future new bridge on the Sava, after the surprising decision by the city authorities to demolish the Old Sava Bridge and build a new one.It was expected for the construction of the tunnel to begin in late 2018 ("at the latest") and to be finished in 30 months, i.e., by the mid-2021.