The Highways Agency said normal traffic conditions would not return to the M4 until 2300 GMT.
That is a more than 400 percent increase over normal traffic for political news, according to the survey.
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Thus, some 310 Mbps of HD video were added to the normal traffic on a 622 Mbps (OC-12) network link.
"I think a million concurrent streams will not work on top of normal video traffic, " said Graham Moore, from web traffic management firm Zeus Technology.
Fifteen times the normal amount of traffic that resulted temporarily crashed the site.
Up and down the road, the flow of traffic looks normal, but just between the two turning flows, there's no traffic at all: it would be possible to cross the road quite safely.
The mayor said subway traffic and other forms of public transportation were "almost back to normal, " but street traffic remained a mess as more commuters returned to work and some entrances to the city, like the Holland Tunnel and Brooklyn-Battery Tunnel, remained closed.
The only access route taking traffic as normal after the landslips was Polperro Hill on the western side, the council said.
But a company that monitors website traffic, Keynote Systems Inc, has reported that traffic appears normal at some of the most-visited US websites, such as Yahoo, Google and Excite.
IP, or Internet Protocol, traffic returned to "near-normal performance levels within about an hour" after the spike in traffic shortly after the attacks occurred, said the Austin, Texas-based company.
Still, at normal driving pace, in traffic or around town, the V-8 just burbles along happily, not noisily.
The road down from the Malakand Pass usually carries little traffic and it seemed normal till 1600.
The preempted traffic light returns to normal operation within a cycle or two.
Illinois Department of Transportation spokesman Mike Claffey said in an email that traffic was lighter than normal on Chicago expressways Tuesday afternoon, an indication that many people took public transportation instead of cars.
Of course, some people can feel unhappy about increased disruption to normal life, security concerns, more traffic congestion and the environmental impact of big events.
Chris Lucas from Amey, the firm that carries out gritting for the area, said roads across the region were not too bad, although traffic was moving slower than normal.
That traffic can be compared with a normal connection to the site to spot any artificial changes in speed.
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It can be a tricky algorithm because you might need a deep queue in normal operation to smooth out momentary bursts of traffic.
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So far, the system had worked, with no fraud reported, although this week, many people could not get through as publicity about the site caused Internet traffic to jump to 28 times normal levels.
At Cingular Wireless, a national mobile operator, network call traffic surged to 400 percent of its normal level from 10 a.m. to 11 a.m.
Then it serves up cards with drive times, traffic alerts, and alternate routes at your normal commuting times.
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And transport bosses' advice about "rerouting, retiming and remoding" journeys seems to have been followed, as it was on Friday when London's traffic levels were around 15% lower than normal ahead of London 2012's opening ceremony.
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Still, Connecticut Transportation Commissioner James Redeker said traffic on roads wasn't significantly worse than normal for the Monday morning commute.
"Helicopters are a valuable tool for police in our normal operations, including investigations, anti-crime operations, traffic management, search and rescue, public order situations, crime reduction initiatives and tackling terrorism, " she said.
The associated slide show lists the 10 cities in America having the worst traffic jams and details the average amount of time lost forever while stuck in traffic (compared to driving when cars are at their normal pace).
However, the levels of traffic seen during these recent attacks were several thousand times the normal load.
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Traffic exploded from about 800, 000 page views on a normal day to more than 30 million a day in the aftermath of the disaster.
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Data shared with the BBC by one ISP which wished to remain anonymous showed that peer-to-peer traffic dipped when the Pirate Bay block initially happened but returned to normal levels within a week.
Traffic on the cellular network was running between 50 percent and 100 percent above normal levels, and its directory assistance and operator services were also overwhelmed, the company said in a statement.
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