An increase in speed limits is just coming into force. It is not the reason for fewer deaths. The reasons for a low numbers are more professional drivers, better vehicles, better signage and all that.
This is why the department wants to review this after five years. We believe that, on the balance of probabilities, the number of accidents and deaths will not go up if we increase the speed limit as suggested. Bearing in mind that heavy goods vehicles break the law by driving at over 50 miles per hour on dual carriageways, we are suggesting 60 miles per hour. Remember that lorries have a meter so that they cannot exceed 56 miles per hour anyway.