I think that the crossing HAS to be the target, if your report is true. 100 mph the wrong way at an international border. Man, your odds of clearing that hurdle are next to zero.
Where are the reports that the car was traveling at 100mph?
It’s the only guess I have because why would you enter into a crossing at that high speed? They don’t usually check outbound cars - you just go through and stop at the booth for the country you are entering? This is weird and hopefully we will learn more information.
I am surprised (but thankful) that more stuff like this does not happen!