Many people come to Nga Tu So Tunnel in Dong Da District early in the morning to exercise. The tunnel connects Truong Chinh, Lang, Tay Son and Nguyen Trai streets.
People run and cycle in the tunnel.
Most of the people are the elderly who want to avoid the bone-chilling cold weather.
According to the National Centre for Hydro-meteorological Forecasting, Hanoi would continue facing the chilly cold weather with light rain on January 27-29. The city is set to see 2-3 cold fronts in February.