The biggest problem with freezing rain is that the studs grip just fine, but when you stop you forget that there's ice on the road and you fall on your ass because your shoes have no traction.
My experience as well Riding in a Van with studded tires and stopping to pee at the Rest Stop on top of the Coast range
on Hwy 26 on the way To Portland from Seaside 12/21/15.. frozen fog-drizzle precipitation as the temperature dropped ,
made it Invisible on the parking lot pavement.