June 20, 2019 - Smyrna - Roberto Jorge (left), and Clifford Blakely, Cobb DOT workers, works on installing signage on the mast. Cobb County is rolling out yet another tool designed to warn drivers of the seven-foot clearance of the Concord Road covered bridge. The county has installed mast arms along Concord Road that will have plastic-covered PVC pipes suspended at seven feet. If a too-tall vehicle hits these pipes, they should not try to pass through the covered bridge. Bob Andres / bandres@ajc.com