16-5  Quality of Transport Routes
　 　 　 　 　 　
Item 1990 1995 2000 2002 2003
　 　 　 　 　 　
  Length of National Railways in Operation (km) 53378 54616 58656 59530 60446
      Double-Tracking Length                             (km) 13024 16909 21408 23058 23702
      Proportion                                                     (%) 24.4 31.0 36.5 38.7 39.2
      Automatic Blocking Length                        (km) 10370 12910 18318 20682 21920
      Proportion                                                     (%) 19.4 23.6 31.2 34.7 36.3
  Length of Highways                                     (km) 1028348 1157009 1402698 1765222 1809828
      Expressway and Class I to IV Highway      (km) 741040 910754 1216013 1382926 1438738
      Proportion                                                    (%) 72.1 78.7 86.7 78.3 79.5
  Length of Navigable Inland Waterways    (km) 109192 110562 119325 121557 123964
      Standard Waterways                                   (km) 56587 61367 63597 60865
      Proportion                                                    (%) 51.2 51.4 52.3 49.1