One of the world's worst traffic jams is about to happen. Here's why

In France, the entire country is divided by one crucial factor -- whether August or July is the best month to go to the beach. It's an issue that annually creates one of the world's biggest traffic snarl-ups and this year forced the government to rethink Covid vaccination rules.

Paris (CNN) — In France, summer holidays are sacred. So much so that the government is willing to bend its own Covid vaccination policies to let French workers hit the beach without worrying about their second injection. Until it did, the public outrage over the prospect that rigid vaccination plans might jeopardize people's summer getaways was enough to unite one of France's biggest divides: "juilletistes" -- those who holiday in July -- and "aoûtiens" -- those who prefer August. To appease these fervent holidaymakers, authorities have agreed to waive a rule that insists second vaccinations must be received in the same place as the first. Now people can choose the locations, including popular vacation destinations.