Ice built up on highways and roads around North Texas is causing many accidents Monday night, and road conditions will continue to worsen overnight.
A Dallas firefighter was killed after falling off a bridge on the I-20 Interchange near Spur 408.
A teen was also killed in a head-on collision in Denton County Monday night.
FOX 4 is told there are icy patches all over the Metroplex, but so far, some of the worst ice is in Northwest Tarrant and Denton counties.
Monday night, Denton police closed parts of 380 due to icy roads and said they roads wouldn't reopen until they had been sanded.
The City of Dallas said it will have crews ready to start sanding roads at midnight, when it activates Ice Force 1.
DART officials said the agency will run trains overnight to "minimize ice buildup on the overhead power lines." Icy power lines have shuttered the light rail system twice in recent years - during the Super Bowl XLV winter storm in 2011 and two months ago in early December.
The Freezing Rain Advisory that North Texas was under Monday has been upgraded to a Winter Weather Advisory through 6 p.m. Tuesday.
Freezing drizzle and freezing fog are expected overnight late Monday going into Tuesday morning.
Temperatures are likely to stay below freezing through noon on Tuesday.
Sleet is expected to mix with freezing rain through the morning hours.
Several smaller school districts have already made the call to cancel or delay classes Tuesday. To see the full list of closings and delays, click here.
DFW Airport is also reporting hundreds of flight delays and cancellations.
KDFW FOX 4
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