China will invest 4.7 trillion yuan ($767 billion) in road projects by 2030, strongly boosting the domestic economy, a senior official said on Thursday.

The country will have more than 400,000 kilometers of national roads and highways by 2030, compared with 173,000 km by 2012, Dai Dongchang, chief planner of the Ministry of Transport, said at a news conference.

The conference released a national plan for the country's road network from 2013 to 2030, approved by the State Council in May.