China, April 17 -- The Nong'an Proving Ground in Changchun, northeast China, built by CSCEC and other companies, has been certified by the World Record Certification & Credibility (WRCAC) as the "Flattest Automotive Test Road", based on an average International Roughness Index (IRI) of 0.83 m/km, significantly outperforming the 2.0 m/km benchmark for China's Class I highways.The project covers approximately 230,000 square meters, including internal road networks, testing zones, supporting test roads, a control center, and auxiliary facilities such as loading areas.As a closed testing base for intelligent connected vehicles, the facility can simulate low-temperature and icy conditions, enabling comprehensive testing and certification while i...