What is the highest route number where you have been on two distinct routes?

Do not count ... I-794/WI 794

Well, mine happens to be 794. While I have been on (and clinched) both I-794 and WI-794, I have also been on (and clinched) NV794.

My highest with

*three* different, unrelated routes is 610 (I-610 (both TX and LA), MN610, and NV610).

My highest with

*four* different, unrelated routes is 371 (US371, CO371, MN371, MO371).

My next highest combo of different routes is actually traveling on 210

*seven* times (I-210/CA210, AL210, AZ210, MN210, MO210, PE210, WY210). I-210 and CA210 are related so counting that as one route.