Once she hits a particularly deserted stretch of road, Starscream drops into a dive, cutting across the road at an altitude low enough that he's probably pretty hard to miss. He sticks a landing in the sand a hundred feet or so off-road, setting his armful of pilfered propane tanks down carefully. So she did make it out, after all... alright, so that's pretty impressive, considering her various handicaps as a tiny little human.