DETROIT — The Regional Transit Authority of Southeast Michigan (RTA) is set to unveil a proposed four-county tax that would raise billions of dollars over 20 years to pay for a bus rapid transit system in the region and a commuter rail line between Detroit and Ann Arbor, Crain’s reports. RTA CEO Michael Ford has said the tax likely would be about 1 to 1.2 mills, which would raise money to build bus rapid transit lines in four corridors, create the long-discussed commuter rail service and cover annual operating costs. Once the master plan is released, a four-week public comment period will begin. The RTA will process the opinions and suggestions it receives from a series of public meetings and refine the plan, if necessary. For the full story, click here .