http://www.9news.com/rss/story.aspx?storyid=346517

There was even a video segment on 9News in the last few days. But...they didn't explain or even mention the ominous signs.

I also recall a military exercise here in Park Co some time ago and there were signs on 285 in South Park re: the exercise. Also, we did a SWAT drill in Greenwood Village (late 90s) and basically took over an entire medium-rise building. Part of the exercise included signage on the major roads (though I don't know if there were any on I-25) in the areas warning of a concentrated police presence and emergency vehicles in the area.

Make of that what you will. I don't think it's unusual at all.