A motorist on the Long Island Expressway has been arrested under Leandra’s Law after, Nassau police said, she drove drunk with her minor children in the vehicle.

A Highway Patrol officer pulled over a BMW westbound near Exit 40 in Jericho about 11:50 p.m. Monday after it crossed lane markings and almost hit the center median, police said.

The driver, Dayna J. Gambino, 23, of New Hyde Park, was under the influence of alcohol, police said, and was arrested.

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Her daughters, age 2 and 6, were left in the custody of a family member, police said.

Gambino was held on bail of $8,000 bond or $4,000 cash at her arraignment in First District Court in Hempstead on a charge of aggravated driving while intoxicated under Leandra’s Law. That law makes it a felony, even on first offense, to drive drunk with children 15 years or younger in the vehicle.