In my opinion you definitely want a heavy coat, hat, gloves, and some sort of boots, even work boots are fine. Although in this day and age it's highly unlikely you'll ever get in a spot where you'd have to walk to safety or get stuck in a truck without heat for quite a long time, but it can happen.
But that stuff will come in handy for more common scenarios like that long walk into the truck stop or fueling up. When you're on I-80 in Wyoming with 50 mph winds and the temp is hovering around zero you'll be glad for the warmer stuff.
Yeah, I walked across the parking lot at the Wamsutter, WY Loves at about 0500 in mid March with shorts and a short sleeve shirt when the wind was howling hard enough I had to lean into it.
I had forgotten what cold really was, and was shivering uncontrollably by the time I walked a couple hundred feet to the door. Most winter weather doesn't bother me, even in shorts, and I'd gotten complacent. Severe wind and cold will claw the heat out of you damn quick if you aren't wearing the right clothing.
Remember the thirty-thirty-thirty rule that I forgot, that time.
An average unprotected person in -30 degree temperatures, in 30 mile per hour winds, has thirty seconds to live.
Think -20F your broke down snow and ice everywhere. What do you think?
There is no bad weather, only bad clothing.
Better to have it and not need it, than to need it and not have it.
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I drove thru WY in April with 3ft of snow. At easter I expect tulips n bunnies...but was shut down for three days hahah take to coat and a pair of carhart boots if possible. I bought a pair in sprimo for $88 would have been $150 back home. So u can buy stuff on th road if needee