Jefferson County Sheriff's Office Deputy Rod Carroll has praised drivers involved in the Interstate 10 crash in Texas for assisting the emergency services.
"It's just people helping people," Carroll told KFDM "The foremost thing in this holiday season is how other travellers were helping us when we were overwhelmed, sitting and holding, putting pressure on people that were injured."
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The police officer was shot in the arm at a petrol station on the Crumlin Road, but is in a stable condition.
Temperatures tumbling again tonight with a widespread sharp frost and lows of -5C or -6C and icy spots in places
The victim was shot in the arm in a 'drive-by' shooting.