The move will see tolls of the Eastern Harbor Crossing and Cross-Harbor Tunnel increase from HK$25 to HK$30, and from HK$20 to HK$30, respectively, while tolls at Western Harbour Crossing will be reduced to HK$60 from HK$75.

The toll for taxis using all three tunnels will remain the same at HK$25 to avoid disputes, sources told.

Meanwhile, a proposal for time-varying tolls at the three tunnels would only kick in a year later as the plan's second phase.

It is understood the three tunnels may charge higher tolls - an increase of up to HK$15 during peak hours.

Sources said authorities would review the change in traffic patterns at the three tunnels after implementing the plan's first phase before moving on to the second phase.