usa – Is it possible to do a u-turn after entering the Ambassador Bridge from the US to avoid leaving the US?

Is it possible to do a u-turn after entering the Ambassador Bridge from the US to avoid leaving the US?

I am reading conflicting reports.

https://k1025.com/this-guy-took-the-bridge-to-canada-exit-in-detroit-by-accident-and-got-deported/ (mirror):

So if you use Exit 47B on Interstate 75 know that you’re going to Canada without any opportunity to U-Turn.

http://ioverlander.com/places/9635-windsor-ontario-canada-to-detroit-michigan-usa (mirror):

If you try a U-turn past US Customs on the bridge you will have some explaining to do but it can be done if you do not want to go across.