Why did Lu 'an become a third-tier city?

The reason why Lu 'an was promoted to a third-tier city is mainly the progress of urban development. All indicators of Lu 'an have reached the standards of third-tier cities, and now it is a quasi-third-tier city, ranking 122 among 337 cities at prefecture level and above in Chinese mainland to 1 17 this year, thus successfully entering the ranks of third-tier cities from last year's fourth-tier cities. In addition, Lu 'an has also made remarkable achievements in traffic development, including the 27.4 km inner ring road bounded by Chang 'an Road, G3 12, West Ring Road and Huashan Road, and the "Lu 'an First Ring Road" expressway network system expected to be formed by 2022, which also provides support for Lu 'an to become a third-tier city.