My column today deals with the ramifications of a “yes” vote to increase the sales tax in Clayton County by one penny to join MARTA. At a recent meeting, Clayton and MARTA leaders predicted a big majority in favor of MARTA on election day, and what that could mean for metro Atlanta. In our second column, a former director of the Governor’s Office of Highway Safety writes about the new varying speed limits on the north end of I-285, which some motorists are criticizing.