With Justin Trudeau officially announcing that the Canada-U.S. border will close for the first time since 9/11, it's important to note that there are a few exceptions.

On Wednesday, the Prime Minister confirmed that the border will temporarily close to all travellers crossing for recreational and tourism purposes. However, essential supply chains such as medicine, food and fuel will not be affected.

Similarly, the roughly 200,000 employees that cross the border daily for their work can also continue to do so.

Justin Trudeau confirms temporary closure of Canada-U.S. border, says both countries will restrict all non-essential travel. PM says critical supply chains (food, fuel, medicines) will not be affected. People who cross the border to work will not be affected.

— CBC News Alerts (@CBCAlerts) March 18, 2020

Trudeau did not give an exact date for when the border will be closing, but he said it will be happening soon.

He also assured Canadians that the government has methods in place to ensure that the border restrictions are enforced, but did not elaborate as to what those methods are.

Trudeau's announcement comes an hour after President Donald Trump broke the news on Twitter, saying that the two countries will "temporarily" close the border by "mutual consent."

We will be, by mutual consent, temporarily closing our Northern Border with Canada to non-essential traffic. Trade will not be affected. Details to follow!

— Donald J. Trump (@realDonaldTrump) March 18, 2020

Approximately $2 billion in goods and merchandise cross the Canada-U.S. border every day, making it essential that the border stay open to trade to avoid an economic collapse.

Trudeau said that these extraordinary measures will last "as long as we feel they need to last."