Return segment of motorway derived from two latlng points

Hey guys,

For a few days I have been looking into the Overpass API but so far I have been unable to get the exact results I want.

I want to get a segment of a motorway, from one point to the other (LatLng points). The point are within a 25m radius from the actual motorway, so fault tolerance is close to zero. So far, so good. However I also would like to get only the way that actually goes into the direction (which is derived from the start and end position). Any ideas?