Kind of makes me remember the US 301 bridge across the Potomac between Virginia and Maryland. Haven’t been across it in years, but back then it was free going north, but had a toll going south.
Sounds like the Confederation Bridge leading from the Canadian mainland over to Prince Edward Island. In 2009 taking the bridge over to the Island was free, but it cost $42 to come back.
I went over that bridge once, and you'd have to pay me to go over it again. The scariest bridge I've ever been on. Not a very "nice" experience.