大欖隧道
The opening of the Tai Lam Tunnel in 1998 brought additional traffic flows to Yuen Long Highway, causing congestion around the Pok Oi Interchange. A dual two-lane vehicular bridge was therefore constructed above the interchange with a view to easing the traffic volume channelling through the roundabout. With the opening of Pok Oi Flyover on 5 February 1999, vehicles travelling between Yuen Long Highway and Tai Lam Tunnel or San Tin Highway no longer have to enter the roundabout at Pok Oi Interchange.