NEW YORK (AP) — A powerful East Coast blizzard menaced would-be travelers by air, rail and highway Monday, leaving thousands without a way to get home after the holidays and shutting down major airports and rail lines for a second day.

Officials urged anyone who did not have to drive to stay off roads in the region, where high winds pushed snow into deep drifts across streets, railroads and runways. Nearly a foot and a half of snow was expected to fall by the time the storm wore out later in the day.

In Monmouth County, N.J., state troopers carried water and food to diabetics marooned on two passenger buses carrying about 50 people on the Garden State Parkway, where stranded cars cluttering ramps stymied snow plows and ambulances, state police spokesman Steve Jones told NBC’s “Today” show. One bus was freed by 7 a.m. and the other was expected to be out soon, he said. Passengers reported no major medical problems.

In New York City, hundreds of travelers dozed Monday in Long Island Rail Road train cars frozen at the platform. Others lay like refugees at the entrance to the train link to Kennedy Airport and stood helpless at the ticket office, waiting in vain for good news to flash on the schedule screens. Hours went by without a single train leaving with passengers.