Despite overnight snow, all major school districts in the immediate Dallas-Fort Worth area were scheduled to open on time Tuesday.

Some districts north of Dallas, including McKinney, Blue Ridge, Celina, Gunter, Howe, Bells and Van Alstyne, announced delayed openings.

Roads in the Dallas-Fort Worth area were mostly clear Tuesday morning, but some lingering icy spots on overpasses caused several cars to slide and spin out. Dallas-Fort Worth roadways already had about three dozen accidents by 6:30 a.m., or six times more than what is reported on a typical morning commute, Traffic Pulse said.

Motorists were advised to use caution on bridges and overpasses.

Icy roads were to blame for a crash that killed a Lewisville man early Tuesday morning. Gabriel Oliva, 48, died around 5 a.m. after losing control of his vehicle as he traveled northbound in the 1500 block of State Highway 121. Mr. Oliva’s car crossed the median and struck a car driven by James Sudduth of The Colony. Mr. Sudduth was transported by helicopter to Methodist Dallas Medical Center. His injuries were not considered life threatening.  

Not all of the accidents were caused by ice, said Kelli Petras, a TxDOT spokeswoman. Three accidents on I-635 Tuesday morning were caused by people driving with insufficient care on wet roads, she said.

Falling temperatures Monday turned sleet to snow for the evening commute, and snow kept falling into the night.

Snow accumulated from north of Collin County to the Red River. Some areas near the Oklahoma border reported snowfall up to three inches.

"Officially out at D/FW, one inch fell," said WFAA-TV meteorologist Greg Fields.

Road crews were as ready for this storm as any other, but the weather didn’t cooperate, Ms. Petras said. The worst possible case for sanding crews is heavy rain followed by ice – which is what happened overnight.

“We weren’t able to pre-treat the roads as much as we would have liked,” she said. “The treatment would have washed off.”

Sanding crews had to wait until the ice actually formed before heading out. That started in McKinney Monday night when TXDOT dispatched its 15 Collin County trucks. “We did the best we could with what we have,” Ms. Petras said.

At Dallas/Fort Worth International Airport and Dallas Love Field, flights were back to normal Tuesday. D/FW reported 121 departures cancellations and some delays Monday night.

Temperatures were above freezing in Dallas and Fort Worth this morning and Mr. Fields told viewers, "It is going to be nice and pleasant today with lots of sunshine."

National Weather Service meteorologist Joe Harris said Tuesday's forecast called for sunny skies and a high temperature of 56 degrees, with no rain. The morning will be breezy, with wind gusts of 10 to 15 mph, he said.

Wednesday is expected to be even warmer, with a high of 66.

Staff writers Phil Oakley, Jeff Weiss, Wendy Hundley, Emily Tsao and WFAA-TV contributed to this report.