China will invest 4.7 trillion yuan ($767 billion) in road projects by 2030, strongly boosting its domestic economy, said Dai Dongchang, chief planner of the Ministry of Transport, at a news conference on June 20.

The country will have more than 400,000 km of national roads and highways by 2030, compared with 173,000 km in 2012, he said.

A national plan for the country's road network from 2013 to 2030 was released at the conference. This plan was approved by the State Council in May.

Dai said that about 2.5 trillion yuan ($408 billion) will be allocated to highway construction, with the remainder going to non-toll roads.

So far, around 900 of the nation's 2,800 counties are not linked to national roads.