Dear mvak36,
In order for you to see the entire route of any interstate, then you must head to your user page, scroll down until you find United States Interstate Highways. Click on the line(don't click on Map or HB, just click on the line), then scroll down to, for example, I-435. You should get a map of the full route. Note: if you choose a route that has business highways(interstate 90 for example), then you will not only get the full interstate 90 route but also the business highways.
I hope this helps.
Thanks,