4. Cyclists passing camera, street traffic in background
5. Wide interior of traffic control centre
9. Big screen showing city's main arterial routes
10. Close-up of traffic control officer
11. Monitors showing traffic
12. Computers with map of city's main arterial routes in background
13. SOUNDBITE (Mandarin) Shao Jie, Director of the Beijing Public Security Bureau, Traffic Control Centre:
"The exhaust from cars is more than twice its usual level. Generally the overall condition of Beijing traffic is pretty good."
14. People waking beside buses
15. Bus crowded with passengers
16. Pedestrians crossing street
17. Subway train arriving at station and passengers getting off
18. SOUNDBITE: (Mandarin) Mr. Li, subway passenger:
"My life is sort of affected by the traffic ban. My child feels tired to take the subway train. It is more comfortable for me to drive, but it is something we should do to give up driving for the sake of blue sky in Beijing and the Beijing Olympics."
Beijing city officials yanked hundreds of thousands of private vehicles off the streets on Friday to test whether a partial car ban would clear health-threatening smog and ease gridlock during next year's Olympic Games.
An estimated 400-thousand private cars were affected by the ban on the first day of the four-day trial, the official Xinhua News Agency reported.
Violators were to be fined 100 yuan (13 US dollars) if caught driving in the city and ordered to return home, a Beijing Traffic Police spokesman said.
Traffic on the main roads flowed at a brisker pace than normal, while police maintained a normally visible presence.
The effect of the partial ban was closely monitored by Beijing's Traffic Control Centre.
The centre's director, Shao Jie, said the new measures were necessary because "the exhaust from cars is more than twice its usual level."
Upwardly mobile Beijingers have grown used to the comforts of driving as private car ownership exploded in the past five years.
Many commuters opted to car pool, take taxis, buses, the subway or take the day off work.
Subway cars were tightly packed with commuters during the morning rush hour.
"I think the traffic ban is a great idea. I strongly support it, as it saves a lot of energy," said one subway commuter.
Emergency vehicles, taxis, buses and other public-service vehicles were exempt as were those given special passes by Beijing Olympic organisers to attend sports test events around the city.
Details of the plan were announced last week by city authorities, who said the four-day plan would take 1.3 (m) million cars off the road.
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