An NYPD highway cop who crashed into a guardrail on a Staten Island highway scored an astounding .43 percent — more than five times the legal limit — on his blood-alcohol test, officials said Saturday.

John Finley, 45, had been driving his SUV — with two flat tires on the passenger side and a bottle of Georgi vodka in the center console — when he crashed on the West Shore Expressway on Aug. 8, according to authorities.

The off-duty officer was the only one in the vehicle.

A witness to the smashup who walked over to help smelled alcohol on Finley’s breath, a criminal complaint says.

The witness also said that Finley was talking unintelligibly.

A 200-pound man would have to drink 23 beers in two hours to score the near-fatal level of .43.

In New York state, a driver can be charged with DUI for a blood alcohol level of a “mere” .08 percent.

After the crash, Finley was taken to Staten Island University Hospital with non-life-threatening injuries. A warrant was obtained for a blood-alcohol test.

He was initially placed under arrest, but the DA deferred prosecution pending the results of the test. He was suspended from the force.

The test results came several days later and Finley was arraigned Friday for aggravated DUI. He was released without bail.