Business leaders on the north end of the Perimeter are proud of the early seed money they put toward the construction of the I-285/Ga. 400 interchange, a $700 million project whose benefits will ripple through the community. In today’s lead column, one leader outlines how the interchange will help and outlines what improvements need to be on the agenda in the near future — including Bus Rapid Transit and the expansion of MARTA. In our second column, a local consultant writes about how he made the change from critic of rail transit to supporter.