A garter snake slithered across a woman’s lap while she was traveling on Interstate 495 in Hopkinton today, State Police said.

The woman was driving southbound in her PT Cruiser when she felt the garter snake on her lap. She immediately pulled over and called her husband, said Trooper Todd Nolan, a State Police spokesman.

Her husband called State Police who arrived on the scene but could not find the snake. Westborough animal control responded; they were also unsuccessful in locating the reptile, Nolan said.

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The woman called AAA to tow her car home so she and her husband could search for the snake more extensively, Nolan said.

The woman was not injured, Nolan said.

Nolan said it wasn’t clear how the snake got in the car.