In an effort to avoid the Rocky Mountains in December, I am looking at driving route 66 straight through (2 adult drivers, car stopping only for fuel.) Could it be done in 2-2.5 days? I would be on it from Chicago to Los Angeles. Other route ideas are also welcome.
You are over-estimating the problems with the Rockies and severely under -estimating the problems with crossing the big empty spaces of the Great Plains in winter
The stretch of I-70 that you have devoted two questions to is about 200 miles and 5 hours
Once you get west of Grand Junction CO on I-70 then really crappy winter weather ceases to be a major issue
From Soldier Field in Chicago there are 4 ways to do this trip and Yes I have driven them all under winter conditions
1) Lake Shore Drive >I-55 S >>I-94 E [Dan Ryan } I-57 S>I-55 S >I40 W>I-15S
Assuming that you leave Chicago in good weather then the weather on that stretch starts getting funky around OKC >Possibily of snow from St Charles NM to ABQ
and then more snow possible from Winslow to Ashfork AZ >West of Ashfork you lose the weather and start hauling ashes into LA >allow 2.-2.5 days
This is your best bad weather option
2) LSD >I-55S>I-44W >I-40 W >I-15 S
This is your Rt 66 option and you already know where the weather is .Try not to hit STL during rush hour
3)LSD>I-55S >I-80 W>I-76 W>I-70 W >I-15S
This is your dreaded crossing of the Rockies at high altitude via the Eisenhower Tunnel
If the weather is crap then Des Moines to Denver and especially Grand Island NE to Denver can be a cold and lonely stretch of road
4)If the weather is good across the Plains then this is the fastest way to do it
LSD>I-55S >I-80 W >I-15S
You have low altitude crossing of the Continental Divide in WY and the only really nasty stretch is from I-80 at the WY/UT line downhill thru Echo Canyon to I-15 S
In all cases carry chains and whatever you need to safely spend a night sleeping in your vehicle
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