Updated

The Port Authority’s pricey perimeter-protection system failed again Wednesday when it failed to detect that a man — dressed as a woman — had hopped a fence at Newark Airport and wandered across two runways, sources told The Post.

Siyah Bryant, 24, of Jersey City, was wearing women’s red pants and a smart brown sweater as he allegedly walked onto the tarmac at about 4:20 a.m. after a tryst in a car near the airport went bad.

Newark’s Perimeter Intrusion Detection System should have alerted officials to Bryant’s presence long before he took his turn on the runway — but the $300 million-plus system flunked.

“The [PIDS] cameras were operating and he was not detected by the PIDS system,” a source said.

Bryant’s misadventure began while he was on “a date” with another man and their car ran out of gas on the New Jersey Turnpike, sources said.

Bryant “felt uncomfortable” when his pal called a third man to bring them fuel, so he set off on foot, sources said.

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