Aerial photo taken on Jan. 19, 2020 shows vehicles waiting to get on board a ro-ro ship at the Xiuying Port in Haikou, capital of south China's Hainan Province. The Qiongzhou strait witnessed a travel rush peak as the Spring Festival is approaching. Photo:Xinhua

Passengers wait to get off a ro-ro ship at the Xiuying Port in Haikou, capital of south China's Hainan Province, Jan. 19, 2020. The Qiongzhou strait witnessed a travel rush peak as the Spring Festival is approaching. Photo:Xinhua

Vehicles get on board a ro-ro ship at the Xiuying Port in Haikou, capital of south China's Hainan Province, Jan. 19, 2020. The Qiongzhou strait witnessed a travel rush peak as the Spring Festival is approaching. Photo:Xinhua

Two workers from central China's Hunan Province walk to board a ferry at the Xiuying Port to go back to their hometown in Haikou, capital of south China's Hainan Province, Jan. 19, 2020. The Qiongzhou strait witnessed a travel rush peak as the Spring Festival is approaching. Photo:Xinhua

Aerial photo taken on Jan. 19, 2020 shows vehicles waiting to get on board a ro-ro ship at the Xiuying Port in Haikou, capital of south China's Hainan Province. The Qiongzhou strait witnessed a travel rush peak as the Spring Festival is approaching. Photo:Xinhua

Aerial photo taken on Jan. 19, 2020 shows ro-ro ships at the Xiuying Port in Haikou, capital of south China's Hainan Province. The Qiongzhou strait witnessed a travel rush peak as the Spring Festival is approaching. Photo:Xinhua

Passengers get on board a ferry at the Xiuying Port in Haikou, capital of south China's Hainan Province, Jan. 19, 2020. The Qiongzhou strait witnessed a travel rush peak as the Spring Festival is approaching. Photo:Xinhua

Passengers get on board a ferry at the Xiuying Port in Haikou, capital of south China's Hainan Province, Jan. 19, 2020. The Qiongzhou strait witnessed a travel rush peak as the Spring Festival is approaching. Photo:Xinhua