I-740 (cancelled)  Arkansas (link)

In the mid-1980s, a proposal circulated to designate US 67 from Little Rock to Bald Knob as Interstate 740. [2] This never came to fruition, but the newest speculation is that it may become part of an extended Interstate 30 or 57.

See also:

• Interstate Guide: I-30 (AARoads)
• Interstate Guide: I-57 (AARoads)

Sources

2. Herzer, Jeffrey. 'I-740.' Personal e-mail, Sep. 10, 2000.