Guangzhou-Huizhou_Expressway
S21 Guangzhou–Huidong Expressway
Road in Guangdong, China
S21 Guanghui Expressway (simplified Chinese: 广惠高速公路; traditional Chinese: 廣惠高速公路; pinyin: Guǎnghuì Gāosùgōnglù) is a route that connects the cities of Guangzhou and Huizhou in the Chinese province of Guangdong.