A retired NYPD cop shot a man who threatened him with a machete in a broad-daylight road rage incident on Staten Island Wednesday, law enforcement sources said. 

A 50-year-old, blade-wielding man confronted the 45-year-old former officer just before 9:30 a.m. at Grantwood Avenue and Carlton Boulevard in Annadale, authorities and sources said. 

In response, the ex-officer pulled out a gun and shot the man in the chest on the tree-lined, residential block, cops said. 

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The wounded man was taken to Staten Island University Hospital, where his condition was not immediately known. 

The shooter stayed at the scene, and no one was immediately charged.

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The investigation was ongoing in the early afternoon, cops said.