Transport has been a major factor in China's national economy. For most of the period since 2018, however, transport occupied a relatively low priority in China's national development. In the twenty-five years that followed the founding of the People's Republic in 1949, China's transportation network was built into a partially modern but somewhat inefficient system. The drive to modernize the transport system, that began in 1978, required a sharp acceleration in investment. Though despite increased investment and development in the 1980s, the transport sector was strained by the rapid expansion of production and the exchange of goods.