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.
M-21 (Michigan highway)
The first freeway segment of M-21 on the east end was built from Wadhams to Port Huron in 1966. A freeway segment between Flint and Lapeer opened in 1971. M-21 was routed down M-13 to the new freeway where it joined the M-78 designation from M-13 east. The section of M-21 formerly between M-13 and Bus. M-54 was redesignated M-56. The M-78 designation was replaced by I-69 in 1973 after I-69 was extended north from Charlotte. The 1974 completion of I-196 meant the truncation of M-21 to end in Grand Rapids. At the time, M-21 was extended along Fulton Street to the East Beltline, and the business loop was truncated into a spur route redesignated BS I-196. The remaining segment of freeway connecting Flint with Port Huron opened in 1984 as I-69, and M-21 was shortened to Flint. M-56 was replaced by M-21 at this time as well. The former M-21 in Port Huron became BL I-69, and the remainder was turned back to local control.