Miami Avenue is like the city's aorta. It's the coursing path tens of thousands of drivers use to travel from north to south each day. But since March, that aorta has been blocked at perhaps its most critical point, the bridge over the Miami River. Seems the metal grating and other parts were decaying and must now be replaced. What does this $5.6 million project mean for you? Well, if you are trying to get from Brickell downtown or vice versa, you may be outta luck... that is, at least until March 2015, when it is forecast to be finished. The northbound lanes are closed now. When that is done, they'll start work on the southbound part of the project.