Tibet's capital Lhasa, the holy city on the "roof of the world," is becoming increasingly clogged up with traffic as more families can afford to buy a car.

Cars crawl along, bumper to bumper, in central Lhasa, capital of Tibet Autonomous Region, yesterday. The increasing number of cars has brought many problems to the city, such as frequent gridlock and a shortage of parking spaces at peak hours and weekends. Among the city's 100,000 vehicles, 80 percent are privately owned.

"It's a real headache to drive during the rush hour - sometimes you have to wait 30 minutes at a crossing," said truck driver Tashi, who, like many Tibetans, goes without a family name.

Tashi travels several times a day between a grocery market near the Potala Palace in the heart of Lhasa and a food street in the outer areas, transporting vegetables and other groceries in his pickup. "It was never congested like this in the past," he said.

Lhasa has more than 100,000 motor vehicles on its 50 kilometers of urban roads. Eighty percent are private cars, according to the city's statistics bureau.

The expanding car fleet is one of the most apparent indicators of local economic growth. Lhasa's GDP has grown by an average 15.5 percent annually to hit 15.43 billion (US$2.32 billion) last year.

Last year, the city's average per capita disposable income reached 15,114 yuan.

But too quickly, local drivers are experiencing the headache of being trapped in long queues, unable to move or park.

Tsering, who works at Tibet's regional association for the disabled, recalled the frustration of waiting for 30 minutes for a parking space near a fast food restaurant downtown, where eating took just 20 minutes.

When Lhasa's biggest shopping mall opened on a busy commercial street east of the Potala Palace last Saturday, the area was congested with cars. "Our parking lot can accommodate 120 cars. At the busiest times, almost 1,000 cars were waiting to park," said a carpark worker.

He said the parking fee was 2 yuan per hour. In big cities like Shanghai, however, the price has been raised to 15 yuan an hour in the busy areas to divert traffic flow.

Lhasa Vice Mayor Wang Hui said 54 car parks, with at least 10,000 parking spaces in total, would be built in the next two years to meet growing demand.

Other initiatives have been suggested to tackle the gridlock.

Kunga Dondrup, an adviser to Tibet's political advisory body, earlier this year suggested authorities restrict traffic through an odd-even license plate system, a move practised in Beijing for more than two years.

"It's necessary to restrict traffic flow and give priority to public transport," he said at an annual political advisory session in Lhasa. "The move will ease congestion and cut emissions."

Last year, Lhasa reported 87 deaths on the road, a 13-percent rise year on year.