Road accidents essentially result from uncivilized behaviour of drivers who refuse to respect the legal and moral rights of others. So the massacre on the road may be regarded as a social problem. Safety standards for vehicles have been raised both at the point of manufacturer and through periodic road worthiness inspection. In addition speed limits have been lowered. Due to these measures the accident rate has decreased. But the accident experts still worry because there has been little or no improvement in the way drivers behave.
According to the passage, the number of accidents has fallen because