The map below is found on the Federal Highway Admistrations Web page:
Freight Transportation Profile - Indiana
http://www.ops.fhwa.dot.gov/freight/publications/state_profiles/Indiana/Indiana.html
We think it calls into question Evansville's "need" for another interstate.
Notice, I-64 is the states least used interstate.
Evansville's highway most used is projected US-41 North. Please
note that this non-interstate is serving Evansville and TerreHaute to
Chicago as well.
Figure 4. Estimated Average Annual Daily Truck Traffic: 2020