Route 3 (Chinese: 三號幹綫) is a series of expressways in Hong Kong that runs from Sai Ying Pun on Hong Kong Island to Yuen Long in the New Territories, linking West Kowloon, Kwai Chung and Tsing Yi. It was built as part of the Airport Core Programme to provide access to Hong Kong International Airport from the city, and to relieve congestion in the New Territories. The Western Harbour Crossing and Tai Lam Tunnel that form part of the route are tollways.

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Route 3
Alignment and exits of Route 3 (zoom in to view exit details)
Route information
Maintained by Highways Department
Length	27.2 km (16.9 mi)
Existed	1998–present
Major junctions
South end	Connaught Road West, Sai Ying Pun
Major intersections	Tsing Sha Highway, Cheung Sha Wan Ching Cheung Road, Kwai Chung Tsuen Wan Road, Kwai Chung Lantau Link, Tsing Yi Tuen Mun Road, Ting Kau
North end	in Yuen Long
Location
Country	China
Special administrative region	Hong Kong
Districts	Central and Western, Yau Tsim Mong, Sham Shui Po, Kwai Tsing, Tsuen Wan, Yuen Long
Highway system
Transport in Hong Kong Routes Roads and Streets
← Route 2 → Route 4

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Route 3
Connaught Road West to Kennedy Town, Central 0.0 Exit 1A & 1B 0.2—2.2 Western Harbour Crossing Victoria Harbour 2.4 Western Harbour Crossing Toll Plaza 2.4 Jordan Road 3.0 Exit 2 Lai Cheung Road to West Kowloon Corridor Tung Chung line, Tuen Ma line, Airport Express 3.9 Expressway begins Olympic Station Nam Cheong Station 6.2 Exit 3 Tsing Sha Highway to Kennedy Town, Central Tuen Ma line 7.7 Exit 4 Mei Ching Road 8.3 Exit 4A Tung Chung line, Airport Express Kwai Chung Road to Tsuen Wan, Lai Chi Kok 9.3 Exit 4B 10.0 Exit 4C Kwai Tsing Road 10.8 Expressway ends 11.0—11.4 Cheung Tsing Bridge Rambler Channel 11.4—13.0 Cheung Tsing Tunnel 13.2 Expressway begins 14.0 Exit 4D 14.1 Exit 4E 14.7 Exit 5 Lantau Link to Lantau, Sha Tin 14.7 Exit 5A 15.2—16.5 Ting Kau Bridge 16.8 Exit 6 Tuen Mun Road to Tuen Mun, Tsuen Wan 11.4 Expressway ends 17.7—21.5 Tai Lam Tunnel 22.8 Tai Lam Tunnel Toll Plaza 23.0 Exit 6A 23.1 Expressway begins 25.0 Exit 6B Kam Tin Road Castle Peak Road Tuen Ma line San Tin Highway, Yuen Long Highway to Sheung Shui, Yuen Long

The route originates at the junction with Route 4 at Connaught Road in Sai Ying Pun, and immediately crosses the Victoria Harbour through the tolled Western Harbour Crossing. From then on it heads northwest on a viaduct along the West Kowloon Highway, above the Tung Chung line and Airport Express tracks. This section has three exits that connects with Route 8, Route 7 and Route 5 respectively. It then enters the Tsing Kwai Highway in Lai Chi Kok and continues west to Tsing Yi Island on Rambler Channel Bridge. Once it reaches the island, the Cheung Tsing Tunnel immediately follows. At the other end of the tunnel, Route 3 enters the Tsing Yi Northwestern Interchange and meet with Route 8 again. The interchange is a gateway to Lantau Island and Chek Lap Kok Airport. Route 3 then makes a sharp turn and travels north on Ting Kau Bridge and quickly enters the tolled Tai Lam Tunnel. From there, the remainder of the route is dubbed the Country Park Section^[1] which runs all the way to Kam Tin along the Tsing Long Highway, and joins Route 9 near Pok Oi Hospital.^[2]

The route is made up of the following roads:

• Western Harbour Crossing
• West Kowloon Highway
• Tsing Kwai Highway
• Cheung Tsing Bridge and Cheung Tsing Tunnel (within Tsing Ma Control Area)
• Cheung Tsing Highway (within Tsing Ma Control Area)
• Ting Kau Bridge (within Tsing Ma Control Area)
• Tai Lam Tunnel
• Tsing Long Highway