on the interstate 

Baseball term that indicates that the player is batting for an average between .100 and .200. The term comes from the "1" at the start of the batting average looking like the "I" designation for the US interstate system and the other numbers relating to a specific interstate.

"How is player X doing this year?"
"Terrible, he's riding on the interstate, cruising down I-80."

on the interstate by M Began June 7, 2019