Hwy 88 closed first and more often because it is the highest trans-Sierra highway that remains open in winter. Miles on Hwy 88 are much longer than miles on 50 or 80.
I bought a Nissan Murano this year. It has AWD and vehicle dynamic control. The VDC engages the antilock breaks in a diagonal patternto correct the vehicle from plowing or fishtailing in corners. It works. Going to Kirkwood on the backroads, I hit black ice a number of times this year. The first time in the Subaru it felt like I had a flat tire, I would turn the wheel, and response was severely delayed (plowing). The ice was invisible, and I actually pulled over to check tire inflation.
Later in the season, I was going up under severe ice conditions in the Murano. I felt the car get out of line, the the computer correction immediately pulled it back in. Damn thing is smarter than me. In open parking lots at Sierra I purposely tried to put the vehicle into a spin. I accellerated hard and turned the wheel hard, but the car tracked, then I jerked the wheel back the other way. All I could do was drift the turn. Now I have no doubt that many drivers will overcome all the technology being put into cars, but this is a far cry from the 1999 GMC Yukon or older Jeep Cherokees I used to drive. I still say, with a 4X4 I was never asked to show chains, and the roads closed before R-3 was imposed. Also, I think you can do serious harm to today's computer controlled AWDs with chains. There are severe warnings about mismatched tires and chain use on some of these vehicles.
And so, we have now turned "A simple (stupid) question" into a car thread for the techno nerds