Interstate 69 in Indiana
The original plan (in a DEIS prepared by INDOT in 2004, but later dropped) was for I-69 to leave the now-former I-164 alignment somewhere just east of Green River Road (exit 3) and head south (instead of turning west with I-164) for approximately before crossing the Ohio at a point near the mouth of the Green River. This portion of the route had not then been funded, as construction of the new Ohio River crossing and its approaches in both states was expected to cost approximately $800 million. Indiana and Kentucky officials had said construction on the new Ohio River Bridge would not begin until at least 2020, after two new crossings near Louisville were completed. With Indiana then preparing to break ground on SIU 3, Kentucky officials indicated that collecting tolls might be the only feasible option for completing the I-69 bridge, as traditional federal and state funding for such projects were drying up. , neither Kentucky nor Indiana officials had yet come up with the money to plan and construct this I-69 bridge.
Business routes of Interstate 69 in Michigan
In 1919, the MSHD signposted the highway system for the first time, and the east–west highway through Port Huron was part of the original M-19, and the north–south highway was part of the original M-27. M-21 was extended over M-19 into Port Huron by 1924. On November 11, 1926, the United States Numbered Highway System was approved by the AASHO, and the new US 25 replaced M-27 in the area. In 1964, a section of I-94 in the Port Huron area was completed. The former route of US 25 through downtown was redesignated Bus. US 25 when the main highway was shifted out to the freeway. The first freeway segment of M-21 was built into the Port Huron area in 1966; the freeway directly tied into the western end of the old route into downtown. In 1973, US 25 was decommissioned in the state, and the former Bus. US 25 was renumbered BL I-94. The remaining segment of freeway along the M-21 corridor opened in 1984 as I-69; after this freeway opened, M-21 was shortened to Flint, and the former M-21 in Port Huron became Business Spur I-69. To connect back to I-69, the business route was extended northward along BL I-94 when that highway was designated through downtown in 1986.