Traffic around Paris hit record levels just hours before a new national lockdown came into force across France, reports BBC News.
Jams stretched to a cumulative 430 miles (700 kms) in the Ile-de-France region early on Thursday evening, local media reported.
Lockdown measures came into force at midnight on Friday (23:00 GMT) to tackle spiralling Covid infections.
People have been ordered to stay at home except for essential work or medical reasons.
President Emmanuel Macron said the country risked being "overwhelmed by a second wave that no doubt will be harder than the first".
Daily Covid-19 deaths in France are at the highest level since April. On Thursday, authorities reported 47,637 new cases and 250 new deaths.
French media report that many Parisians have left the city to spend lockdown in the countryside.
Anna, 24, told Le Figaro newspaper that she had left her family's Paris apartment for their second home in Bernay in northern France. She said spending the first lockdown in Paris was "psychologically hard" - but in Bernay, "the air is cleaner, we breathe, we feel free".
A similar exodus happened in March, when the first lockdown came into force. At the time some residents of French regions were hostile to Parisians who had fled the capital.
"We're asking people to stay at home and Parisians to stay in Paris. You can well understand that if 4,000 people from Paris invade and one-third of them are infected without knowing, obviously it risks spreading rapidly," wrote one commentator in the local Sud Ouest (South-West) newspaper.