it has therefore been suggested that cultivating alternative sources of transport financing should be a priority the periods on the xaxis correspond to the seven year economic development plans which were first launched in and terminated in however more recently the share of its total public investment devoted to transport infrastructure decreased from to between and railways and especially highspeed railways have also gradually surfaced back as an alternative response to carcentred development and to the side effects of the latter such as congestion and environmental degradation the highspeed korea train express ktx first inaugurated in handled of total rail traffic in