Its eastern terminus is at the Tseung Kwan O Interchange of the Cross Bay Link.

Although not officially part of Route 6, the Cross Bay Link carries traffic further to its two eastern termini, one at Po Shun Road in Tseung Kwan O and the other at Wan O Road in LOHAS Park.

When completed, it will continue from its current terminus at the Lam Tin Interchange through new underground tunnels.

First, it will continue in an unnamed submarine tunnel towards the Kai Tak Development Area, intersecting with Route 5 on the way.

It has already fulfilled its secondary purpose to serve as an alternative route for the existing Tseung Kwan O Tunnel.