There are divided views over a government proposal to impose congestion charges at the city's three cross-harbour tunnels, with some saying it could reduce traffic flow and others arguing that drivers should not be "punished" for poor urban planning.

The Transport Bureau earlier said the charges could be introduced after the government takes back the Western Harbour Crossing from its franchisee in August next year.

Under the plan, the city’s three cross-harbour tunnels could charge higher tolls during rush hours to encourage people to travel at other times or use public transport.

Speaking on an RTHK programme on Monday, DAB lawmaker Ben Chan welcomes the proposal.

"Some drivers have no choice but to cross the harbour at fixed times, but others may leave home at an earlier or later hour. They can enjoy a cheaper toll under the proposal, which offers flexibility to everyone," he said.

But he said other measures, such as the building of more park-and-ride facilities, are also needed to better tackle the SAR's congestion problem.

Meanwhile, the president of the Hong Kong Automobile Association, Ringo Lee, said many people have moved to the New Territories because of the city's high property prices but still have to commute to Hong Kong Island every day for work.

He said drivers should not have to bear the burden of the government's failure to build more roads and improve traffic.

"If the congestion charges are to be imposed, all bosses and the government should allow their staff to have flexible working hours," he said.

He called on the administration to build a fourth cross-harbour tunnel or a cross-harbour bridge.