A Montana State Trooper pulled over this Subaru Outback earlier this month:
That vehicle, in that condition, had been driving on Interstate 90--on an interstate journey, no less. So how did the driver see?
"The driver admitted to traveling across several states in this condition, using safety glasses to keep the shards of glass out of his eyes as he looked through the peephole." --Montana Highway Patrol Facebook page
Following the traffic stop, the vehicle was towed away.