This question is answered in Robot Game Update #3, at†http://www.firstlegoleague.org/challenge/robotgameupdates
Objects scoring in the YELLOW zone donít count as being on the runway, and wonít cause the loss of your clear runway points.† When roof debris is in the LT BLUE zone, same thing, it wonít ruin your runway points.
Plus, to be clear, this update does not require that the ambulance (or other object) is "completely in" the Yellow zone, only that it is "scoring in the Yellow zone".
VA/DC FLL Referee Advisor
† †If the ambulance is completely in the yellow zone, is the runway
considered as clean and is the score for that 30 pts?
Appreciate if some one can answer this ASAP?