This is a very specific problem and is very hard to answer without some knowledge about your code. I'm not sure if gamedev is the right place for this kind of question?
My guess is that your entities aren't located in the same coordinate space. Is the
ourcar entity placed in the same level as the
exit entity? If
exit is on
ourcar needs to be on
_level0 as well. Otherwise you'll have to convert the coordinates of
ourcar to the coordinate-space of
_level0 and then perform the hit-test using these coordinates.
Edit: Sorry, it has been a long time since I last used
hitTest. According to this page, the x and y coordinates must always be global coordinates. So you have to make sure the
y coordinates are relative to the global coordinate space. You can use localToGlobal to calculate these.