The current model has troopers issuing tickets for improper equipment, or too fast for conditions, after the crash/highway closure occurs. Too little/too late IMO.
I don't know how you do it without creating hudge back-ups (but probably not as hudge as a multi-vehicle pile-up), but my vote would be for an equipment check at Morrison, with parking and alternate transportation (buses with chains?) in the lots at mile post 259. While I'm dreaming; this is also where I'd place the Eastern terminus of the sweet covered guide-way mag-lev high-speed rail, or just run it straight from DIA to Eagle.
I know the feasibility studies showed the rail would likely not get enough ridership to cover the cost of building, but IMO lane expansion (that's immediately reduced to single-lane in adverse conditions) isn't the answer either.
Let's build the worlds longest gondola system. Heated with Wi-Fi just like Vail's Gondi One.