Yep, once you leave the interstate, road conditions can get awful in a hurry.
Fastest is not the I90/I15 route, but if you do encounter poor driving conditions, accidents or closures, you'll lose a lot more time. I found the cross winds in that region to be especially bad this time of year.
Interstates are most likely to be plowed, multi-lane and will have gas/amenities.
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