Some portions of these highways are built to Interstate standards, though.

This freeway was originally part of I-20 and is built to Interstate standards.

It is a four to six-lane freeway on 8-lane right-of-way, constructed to Interstate standards.

The highway has been built entirely to Interstate standards.

Most of the 10.2-mile corridor, constructed between 1990 and 2001, was built to Interstate standards.

Starting in 1968 through the early 1970s, M-76 was rebuilt to Interstate standards in stages.

The entire freeway is planned for upgrade to Interstate standards.

Having been built in the early 1990s, this section was already up to Interstate standards.

Portions of the highway in Mississippi must be upgraded to current Interstate standards.

The study is geared toward upgrading the rest of the section to Interstate standards.