Colorado Apparatus Struck While Blocking

South Metro, CO E-36 was recently re-positioned at a motor vehicle collision off the side of an interstate highway. E-36 was being relocated to provide the blocking function for the crews treating the victims of the collision. The Engineer noticed two vehicles sliding towards the incident on a snowy/icy road. The Engineer blasted the air horn to notify the crew of the impending danger. The sliding vehicles, two SUV's, struck E-36 and moved it 5 feet.