The freeway portion opened on October 12, 1970; it was constructed four lanes wide.

The freeway portion of the highway is known as the Crosstown Expressway.

In the late 1990s and early 2000s, the freeway portion was extended several miles beyond Fresno in both directions.

Several options were considered and then later abandoned for the freeway portion through Hartford and points north.

It is the westernmost freeway portion of State Route 91.

The freeway portion of SR 23 opened in several phases between 1971 and 1994.

The freeway portion that US 611 followed became a part of I-80 in 1959.

Midway through the valley the freeway portion temporarily ends.

A new freeway portion through Pleasant Valley is also currently under construction.

The freeway portion ends at the junction with Route 111 in Trumbull.