16-5  Quality of Transport Routes
Item	1990	1995	2000	2009	2010
Length of National Railways in Operation (km)	53378	54616	58656	65491	66239
Double-Tracking Length                             (km)	13024	16909	21408	28682	29684
Proportion                                                     (%)	24.4	31.0	36.5	43.8	44.8
Automatic Blocking Length                        (km)	10370	12910	18318	31619	37500
Length of Highways                                     (km)	1028348	1157009	1402698	3860823	4008229
Expressway and Class I to IV Highways     (km)	741040	910754	1216013	3056265	3304709
Proportion                                                    (%)	72.1	78.7	86.7	79.2	82.4
Length of Navigable Inland Waterways    (km)	109192	110562	119325	123683	124242
Standard Waterways                                   (km)		56587	61367	61546	62290
Proportion                                                    (%)		51.2	51.4	49.8	50.1