Bucharest City Hall says the streets leading to the park where Madonna will hold the open-air concert will be temporarily turned into pedestrian areas. Buses will run on different routes.
The Aug. 26 concert takes place in Izvor Park, where late Pope John Paul II spoke to Romanian crowds in 1999.
It is yards from the giant palace built by late dictator Nicolae Ceausescu, rated the second-largest official building in the world, after the Pentagon.
Madonna arrives in Bucharest after a concert in Belgrade in neighboring Serbia. Tickets cost between $43 and $270.