‘Protective barrier may have stopped crash’

Bonhomme resident Jerome Davis has been thanking his lucky stars that a vehicle, which crashed off the main road just behind his home, did not cause any damage to the partially completed structure.
Davis says that he has been complaining for some time now about the need for a protective barrier to be constructed along the embankment above his home since he claims there have been several near misses by persons travelling along this stretch of road. {{more}}The driver of this car, however, went the whole way Sunday and landed upside down in Davis’ yard. The startled driver emerged unhurt and had his damaged vehicle towed away sometime later.
Question is: would a protective barrier have saved this driver, or would more careful driving have?