I don’t know, I was once in the ass end of canada looking for a ferry or something I really do not remember, but I saw something that looked like they might take tolls, but I ended up in a different country with pretty much no other way out except a ferry you have to reserve well in advance.
I did a U turn and the border guard who had watched the whole thing gave me the 3rd degree according to her script but eventually finally let me back into Canada
Some unfortunate truck driver was hauling truckload of guns on I-10.
In El Paso, he made wrong turn and ended up in Mexico.
He tried to make quick U turn back to the US, but was stopped, arrested for having guns in Mexico and put in jail for years!
I am not sure, how it ended, but last I checked, he was still rotting in Mexican jail!
I would rather be deported!