A Long Island teacher has mysteriously vanished – and in a bizarre twist, her dad spotted her abandoned car along the side of a highway as he drove a school bus full of kids.

Leah Walsh, 29, of Bethpage, who teaches autistic kids in Glen Cove, was reported missing after the school called her mother to say she never showed up Monday, cops said.

Around noon, her father, Howard Hirschel, spotted her black Ford Focus with the front left tire flat on the side of the Seaford-Oyster Bay Expressway in Bethpage.

Hirschel pulled over his bus and called Walsh’s husband, who came to the scene and notified cops.

Leah’s purse was in a nearby ditch and her book bag was on the front seat, cops said.

Her husband, William, told reporters, “You can have my cars, you can have everything. I just want my wife back.”

Police said William is a mortgage broker; Leah’s mom, Mattie Hirschel, said her son-in-law had recently lost his job but had gotten a new one.

William said his last contact with his wife was a text message she sent at 6:25 a.m. that read, “Have a great day. Love bunches muaw,” the last word a texting shorthand for a “kiss” sound.

A state Department of Transportation truck stuck a tag on Leah’s car at 6:30 a.m., saying it was disabled and abandoned.

The missing teacher’s close friend, Lucas Bean, said his pal had been having marital problems and she and her husband had a big fight Saturday night.

Walsh said of his wife of three years, “I believe she had a flat and I think she got out to look at it and was getting back in the car to call me. She’s just got to be somewhere.”

He was reinterviewed today by Nassau County cops.

Leah’s frantic mom, Mattie, begged, “Just bring her back. She’s my baby.”

Bean described his friend as “one of the most upbeat people” who’s passionate about her job teaching special-needs kids.

“Think about the person it takes to do something like that,” he said. “She loves what she’s doing – she’s found her path.”

Her husband said that on Monday, she left their home early to get to the School for Language Development to work on her lesson plans.

Additional reporting by Selim Algar

kieran.crowley@nypost.com