15-5    Quality of Transport Routes
Item	1978	1990	1995	2000	2001
						Length of National Railways in Operation     (km)	48618	53378	54616	58656	59079
Double-Tracking Length          (km)	7630	13024	16909	21408	22640
Proportion                      (%)	15.7	24.4	31	36.5	38.3
Automatic Blocking Length       (km)	5981	10370	12910	18317.8	18844.7
Proportion                      (%)	12.3	19.4	23.6	31.2	31.9
Length of Highways                  (km)	890236	1028348	1157009	1402698	1698012
Expressway and Class I to IV Highway		741040	910754	1216013	1336044
Proportion                      (%)		72.1	78.7	86.7	78.7
Length of Navigable Inland Waterways  (km)	135952	109192	110562	119325	121535
Standard Waterways                          (km)			56587	61367	63692
Proportion                      (%)			51.2	51.4	52.4