The intersection between San Tin Highway and Fanling Highway is the San Tin Interchange. Slip roads from San Tin Interchange on to San Sham Road lead 2 km north to Hong Kong's only 24-hour border crossing at the Lok Ma Chau Control Point–Huanggang Port border crossing with Shenzhen in mainland China. The slip roads were completed in January 2007.[3] Before their construction, the vast amount of lorries and goods vehicles using the roundabout caused serious traffic congestion, on San Sham Road and occasionally on San Tin Highway.
Before the completion of Tsing Long Highway, the southern end of the Highway connected to Castle Peak Road and Au Tau Interchange. When Tsing Long Highway was opened in 1998, San Tin Highway was connected to it, thus linking up with Tai Lam Tunnel and Yuen Long Highway. The interchange near Fairview Park is the roundabout which has the most exits in Hong Kong. It has 7 entrances and exits which lead to:
Fairview Park (Joining Fairview Park Boulevard)
San Tin Highway (Bidirectional)
Castle Peak Road — Tam Mi (Bidirectional)
San Tam Road (Bidirectional)
Interchanges
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Route 3 at Au Tau.jpg)
