The U.S. Department of Transportation has summoned Pittsburgh and the six other finalists in the Smart City Challenge to Washington, D.C., for one last attempt to convince federal officials they have the best proposal to revitalize transportation in their cities. The winner will be announced by the end of the month. “We’re doing something a little different here, a little exciting,” said Jon Romano, spokesman for the 6/7/2016 Smart City Challenge“We’re going to have everyone come in and make a pitch like an advertising campaign.” Each city will present a 3-minute video and make a 7-minute oral presentation describing its proposal, some of which are 60 pages or more, Mr. Romano said. Pittsburgh Mayor Bill Peduto will head a team of a half-dozen and make the oral presentation.