Houston Police officers have so far responded to more than 800 traffic accidents in the city overnight and through today, said Houston Mayor Annise Parker at an afternoon news conference at TransStar, the local emergency management center.

So far, the only accident resulting in a fatality was a man on the East Freeway.

Houston police are asking motorists involved in traffic accidents that disable their vehicles in icy conditions to call 9-1-1 and remain in their vehicles until a police officer or wrecker driver arrives at the scene.

One man, 30, was killed earlier today after he got out of his disabled vehicle and sat on a guardrail on the Interstate 10 overpass near Federal Road. He was struck as a result of two trucks that slid in the icy conditions.

With freezing weather expected throughout tonight and into tomorrow morning, HPD urges residents to refrain from driving, especially on highways or overpasses, unless they absolutely have to.