Park Road 68 was established along its current route in 1974.

In 1950, it was placed on the current route, and has not been changed since.

By 1940, the highway was changed to its current route.

The current route of the S 2 was established in 2009.

In 2009 the line was replaced by its current route.

The current route 182 was introduced on 13 June 1970.

Construction for its current route was expected to be completed by 2019.

Several options were considered and the current route was selected in 1983.

In 1940, Illinois 151 was placed onto its current route.

The third option was that of the current route down the mountain to the west.