In Utah
Guard rails are optional
not real optional in Oregon... they usually don't have any... in most places they need them...
and slick wet roads in Western Oregon ALL winter, on foggy roads...
eastern Oregon, slick icy roads....
then to add to the fun, we have more than our share of Mexicans and Californians passing thru at unsafe speeds for the road conditions...
that along with a safe distance behind you is about 5 yards on Interstate 5... hence why we end up with multi car pileups the closer you get to Potlandia...
can't leave out the Washington Plate Cars contributions either... nor many of our local Oregonian Beavis and Buttheads....
you don't have to slow down too much and stay in the right lane, to avoid most of the Kamikaze Pilots in the left lane....