“No one is to know,” ran the text from an NYPD sergeant from the unit tasked with Mayor Bill de Blasio’s security. “Not even the other teams.” The goal: covering up a mayoral traffic accident when de Blasio was pushing his Vision Zero plan to reduce accidents.

The Daily News evidently got onto the August 2015 conspiracy thanks to former members of the detail who’ve since brought discrimination claims. But the facts speak for themselves: The commander of the unit, Howard Redmond, wanted the whole thing hushed up. Another text notes Redmond’s concern was “about people knowing the story of the accident, not the accident itself.”

It looks like no report on de Blasio’s collision made it into the state Department of Motor Vehicles records, even though the damage likely exceeded the $1,000 line that’s supposed to require a report.

Whether the point of the coverup was to avoid embarrassing the mayor or the unit (which was responsible for the accident) is unclear. But it’s worth noting that, at the time, he was fresh off a failed push for a freeze on Uber and other black-car services in the name of reducing congestion and boosting traffic safety.

He was also under fire for his failure to move quickly on the Legionnaires’ epidemic in the Bronx and his refusal to cut a workout short to respond to a Staten Island shooting, among other issues that had driven his poll numbers to new lows.

Oh, and blaming his various woes on the press, which he claimed was easier on his predecessor, Mike Bloomberg: “I think the media had a kind of kid-gloves sensibility toward him,” de Blasio told The New York Times. “I think that’s well-established.”

No one in this administration ever seems to consider that the problem isn’t the mirror, but what they see in it.