NEW York City is creating "checkpoints" to enforce mandatory quarantines for any visitors that are arriving from coronavirus hotspot states.
The checkpoints will be located at bridges and tunnels entering into the city.
Mayor Bill de Blasio announced the measure to enforce Governor Andrew Cuomo's mandatory 14-day quarantine on Wednesday.
Mayor de Blasio said: "The checkpoints are going to send a very powerful message that this quarantine is serious.
"Even if we can't reach every single person I think it'll get the message across.
"We don't want to penalize people. We want to educate them, make sure they're following the rules."
The required quarantine states are currently Alaska, Alabama, Arkansas, Arizona, California, Florida, Georgia, Iowa, Idaho, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maryland, Minnesota, Missouri, Mississippi, Montana, North Carolina, North Dakota, Nebraska, New Mexico, Nevada, Ohio, Oklahoma, Puerto Rico, Rhode Island, South Carolina, Tennessee, Texas, Utah, Virginia, Washington and Wisconsin.
"Our progress in New York is even better than we expected, thanks to the hard work of New Yorkers," Cuomo said on Tuesday.
"Our numbers continue to decline steadily, and for the third straight day in a row, there were no reported deaths in New York City.
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"But we must protect that progress, which is why today we are adding another state to our travel advisory.
"We cannot go back to the hell we experienced just a few months ago - and surging infection rates across the country threaten to bring us back there - so we must all remain vigilant."
The state currently has at least 417,589 confirmed coronavirus cases.