At 1700 GMT the roads had reopened, but tailbacks continued in the city centre.
Tailbacks Mark Ingram and Trent Richardson had been first-rounders the past two years.
Travellers took to the roads instead, causing long tailbacks - 40km jams were reported on the Paris ring road.
At one point the Belfast Road at Saintfield was closed following an accident, causing long tailbacks between Ballygowan and Belfast.
The regional traffic information centre said the blockade caused tailbacks of five kilometres on the Paris-bound carriageway of the A630.
Kent Police said there were long tailbacks on both sides of the carriageway, and advised drivers to avoid the area.
Kent and Sussex roads were worst hit by the adverse conditions, with many blocked or closed and with huge tailbacks building up.
At 1400 GMT, Cheshire Police said there were about 100 lorries waiting to get into the salt works, causing tailbacks in nearby towns.
By midday, however, the tailbacks had eased as more fans followed police directions and left their cars a safe distance from the circuit.
Around 250 vehicles blocked the bridge for five hours on Sunday, causing tailbacks of up to five kilometres on a public holiday weekend.
Tailbacks Jerome Smith, Devante McFarlane and George Morris III combined to rush 120 yards on 25 carries, with Morris scoring on a nifty 39-yard run.
Naturally the project also aims to improve traffic safety, reduce environmental impact and - thanks to smooth speed control - cut the risk of traffic tailbacks.
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Even the official Xinhua news agency joined the criticism after complaints that motorists were stopping so abruptly at traffic lights that they were causing collisions and tailbacks.
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