What it does
A plain-language summary is coming. Here is the official summary from the Congressional Research Service:
This act designates U.S. Route 20 in the states of Oregon, Idaho, Montana, Wyoming, Nebraska, Iowa, Illinois, Indiana, Ohio, Pennsylvania, New York, and Massachusetts as the National Medal of Honor Highway.
How Congress voted
This law passed by voice vote or unanimous consent, so there is no record of how individual members voted.