I'm driving from Chicago to the Grand Canyon over a couple of weeks. One night we will be in mid-Nebraska and driving through Colorado on I-70 the next day with an overnight stop in Glenwood Springs. Do people get altitude sickens driving this route? I wanted to take Loveland Pass and get a photo at the Continental Divide sign but, being a flatlander, I'm worried about altitude sickness. How safe is it just driving through Colorado?