@tux67 this is why vehicle=destination is so wrong here.  You can drive your car between these endpoints I shared above.  pontstrasse is not closed at the moment.  But you can't drive on the path the routing algorithm gives you because there is construction.  you can go around it, and enter pontstrasse from kreuzherrenstrasse and exit from saarstrasse.  I drive this route almost every day and osm is horribly broken at the moment due to the incorrect vehicle=destination tag.

shall I take pictures?  it is clear you have no idea how this construction zone looks like.