The country's first special economic zone in Guangdong province is studying the possibility of collecting congestion fees and further raising parking fees in the following months to help decongest its clogged roads.

Huang Min, director of the Shenzhen Traffic and Transport Commission, said the city is working on a package of measures to unsnarl its traffic jams, including further improving the management of vehicles and roads.

"Shenzhen will speed up construction of the metro and track traffic and open more bus routes to encourage more local residents and tourists to use the city's public transportation facilities," Huang said.

Wang Guowen, a researcher from the Shenzhen Comprehensive Development Institute, said the collection of congestion fees indicates the government is introducing market principles to tackle the city's traffic problems.

"Many overseas nations and regions, including Hong Kong, have introduced such market methods to help reduce the number of vehicles operating on their roads," Wang said.

"But how to collect the congestion fees? Relevant departments should hold a hearing to seek opinions from the public," Wang added.

Lu Huapu, a professor from Tsinghua University, said collecting congestion fees would certainly help ease traffic jams in Shenzhen, but it cannot tackle the problem at its roots.

"Relevant departments should further improve the city's public transport systems and lower the charges for using public facilities before congestion fees are collected," said Lu, a traffic planning expert.

According to a five-year plan of improving the city's public transport capacity, Shenzhen is expected to become the country's first city to build special high-occupancy vehicle lanes in the Chinese mainland, Huang said.

Shenzhen will build an additional 150 kilometers of special bus lanes this year, and another 100 km in 2012, Huang said.

By the end of 2013, Shenzhen will have special bus lanes reaching more than 400 km.

And Shenzhen will put 3,000 new buses into service in the following five years, Huang said.

Shenzhen now has the mainland's highest vehicle density. More than 1.7 million vehicles had been registered in the city by the end of last year, approaching the official limit. But there are actually more than 1.9 million vehicles, in addition to cars from outside the city, Shenzhen traffic department figures showed.

Xinhua and?China?Daily contributed to the story.