I'm planning to drive w/ my two kids (ages 2 & 4) from Denver to LA. I've heard different things about the road conditions through the Rocky Mountains along I-70. Do they close down the mountain roads? What would be the best alternative route, if they do? I just don't want to be stuck in blizzard like conditions w/ no where to turn w/ my little ones in the car. Is this even safe? Or should I just buy plane tickets?

Thanks to all for your help & advice.