Officer was first on scene of one of the worst traffic accidents in US history

Extreme Dense Fog Sign on I-75 in Tennessee in 1990. (NTSB) On the morning of Dec. 11, 1990, Bill Dyer’s day began with a routine assignment: He was told to patrol the north end of Bradley County, Tennessee, for the county sheriff’s office. It was a beautiful morning as his shift began shortly before 9 a.m. The sun was shining brightly amid a clear blue sky. All seemed calm and fairly routine. Yet, as he ventured farther north toward the…