A survey finds drunk drivers are to blame for making Superbowl Sunday one of the deadliest days of the year to be on the road. The Insurance Information Institute tallied 108 fatal accidents nationwide on Superbowl Sunday of 1999. Of those, 52, or almost half, were alcohol-related. Institute spokeswoman Elizabeth Mosley says football party hosts need to be responsible by monitoring how much guests drink.Mosley says hosts can be held financially responsible for a guest’s actions after they leave the party. She says hosts should assign designated drivers and offer to have guests stay overnight if they’ve had too much to drink.While it’s a deadly day nationwide, an Iowa D-O-T official says of the last five Superbowl Sundays, only two people have been killed in crashes on Iowa’s roads.