Plans to replace the I-84 viaduct in downtown Hartford have been put on hold for up to three years while the Connecticut Dept. of Transportation seeks to better coordinate the $5-billion project with other area transportation needs. With a current $60-million repair project expected to keep the 60-year-old, two-mile system of structures safe and functional to at least 2040, the agency will conduct a broader mobility study that incorporates other potential transportation improvements, including relocation of the existing I-84/I-91 interchange, as well as improvements to bus and rail lines.