The aerial photo of Canton Tower.

A new expressway linking three major cities in Guangdong province officially opened on Wednesday afternoon, further promoting the integrated and high-quality development of the Guangdong-Hong Kong-Macao Greater Bay Area.

Through the new Nansha-Zhongshan Expressway, vehicles can travel from Guangzhou's Nansha district to the Shenzhen special economic zone in less than 20 minutes and to Zhongshan in about 15 minutes. Connected with the Shenzhen-Zhongshan Link that operates across the estuary of the Pearl River, it further advances economic ties between cities in the eastern and western parts of the Pearl River delta.

Previously, it took more than an hour for drivers to complete the journey between Zhongshan and the Shenzhen special economic zone via the Humen or Nansha bridges, which have witnessed heavy traffic jams during peak periods. Now, they can drive between the two areas in about 30 minutes.

The 32.4-kilometer-long, six-lane two-way expressway, with a speed limit of 100 kilometers per hour, consists of the 21.6-kilometer-long main road and the 10.8-kilometer-long Wanqingsha Branch road. It will help Nansha Port improve its gateway function and achieve high-quality development.

The project is also expected to strengthen the direct connection between Nansha, located at the mouth of the Pearl River, and major cities in the GBA, said Guo Sheng, deputy director of Nansha district's housing and urban-rural development bureau.

The expressway will provide huge opportunities for Nansha, a shipping hub in the southern Chinese region, to participate in the construction of the GBA and help the district open up more to the outside world.

The new highway further connects the three pilot free trade zones of Qianhai in Shenzhen, Hengqin in Zhuhai and Nansha together. Together with the Shenzhen-Zhongshan Link, people in Guangzhou, Shenzhen and Zhongshan can reach each city within 30 minutes.

"Nansha already has subways, light railways and intercity railway networks to connect with major cities in the GBA," said Guo.

Li Jing, chief planner with Department of Transport of Guangdong Province, said the province would further accelerate the construction of infrastructure and actively expand effective investment in transportation to further improve the highway network along the Shenzhen-Zhongshan Link and surrounding areas.

The move aims to promote high-level connectivity within and outside the GBA, playing a pioneering role in transportation to better serve and support Guangdong's opening-up to the outside world and high-quality development, Li said.

Meanwhile, transportation departments in Guangzhou and Shenzhen have also opened intercity bus routes to link Nansha district to Shenzhen and Nansha to the Shenzhen Bao'an International Airport to strengthen the connection between the two cities on Wednesday.

The Shenzhen-Zhongshan Link, which opened in June, connects the city clusters of Shenzhen, Dongguan and Huizhou in the eastern part of the Pearl River Delta to the prosperous cities of Guangzhou, Zhuhai, Foshan, Zhongshan, Jiangmen and Zhaoqing in the western part, further enhancing infrastructure connectivity, cooperation and exchanges among the GBA cities.