>>1029970*a correction, that is Guangzhou not Shenzhen.
Line 18/22 lines are designed to alleviate pressure on existing line 3, and they also function as a connection to faraway new districts like Nansha into city center and then extend to the north to connect with the airport. Because L18 run parallel to L3 so it can skip several smaller regions that are already served by L3 to provide higher speed link with faraway region. The segment linking Nansha and city center of Guangzhou together will be 51km(L22)/65km(L18) long and the journey time is planned to be under 30 minutes.
The attached picture is the expected system map in 2028 as illustrated by netizen (which I have not obtain permission to repost so don't repost this)
