 There are two metro lines under construction in Hanoi now, as part of the master plan for the future Hanoi Metro system.Line 2A currently has no opening date after failure to meet the deadline at the end of 2019, while Line 3 is expected to begin operation in 2022.Persons on their own or traveling in a pair who wish to make a fast trip around Hanoi to avoid traffic jams or to travel at an irregular time or by way of an irregular route often use "xe ôm" (literally, "hug bike").