The secondary issue is the stupidity of semi-drivers to have tried to keep driving in the storm. It wasn't like there was no warning at all. Reports I have read indicate disabled trucks are the largest impediment to getting things going again.
The key thing is that they have equipment and close roads to trucks. VA express lanes gouge drivers avoiding traffic, there should be plenty of money to put plows on 2 1/2 ton trucks.
More plows in my opinion would definitely have helped as long as they were dispersing treated road salt. During snow storms, traffic on our interstates do not grind to a halt because there is a constant rotation of plows for every lane doing the best that they can to keep the priority routes clear.
VDOT could just close the freeway section in advance of the storm if they knew they didn't have the capacity to keep up with the snowfall and have the road be drive able, like other state DOTs do for their freeways when bad weather is coming. I feel like this must have been a textbook whiff in transit department circles.
Closing the freeway feels like a good idea, but then you’d have ~130,000 cars/day traveling on surface streets? The Rappahannock doesn’t allow for many crossings other than 95.