THE ASSOCIATED PRESS

Canada on Monday is lifting its prohibition on Americans crossing the border to shop, vacation or visit, but the United States is keeping similar restrictions in place for Canadians, part of a bumpy return to normalcy from COVID-19 travel bans.

U.S. citizens and legal permanent residents must be both fully vaccinated and test negative for COVID-19 within three days to get across one of the world’s longest and busiest land borders. Travelers also must fill out a detailed on application on the arriveCAN app before crossing.

Even though travelers have to register, the Canada Border Services Agency won’t say how many people they are expecting to enter Canada for the reopening. But travelers should plan for the possibility of additional processing time at the border.

“CBSA will not compromise the health and safety of Canadians for the sake of border wait times,” agency spokeswoman Rebecca Purdy said in a statement.

While the Canada Border Services Agency won’t say how many people it’s expecting, Garnet Health, an Essex, Vermont-based company that offers same-day COVID-19 testing, has seen the number of tests it performs more than triple in recent weeks. The increase coincides with Canada’s decision last month to drop a two-week quarantine requirement for its citizens when they return home from the U.S.