Thursday, Sept. 7, the Tennessee Highway Safety Office (THSO) released video commentary called “Knock at the Door Discussed” to inform Tennesseans on the purpose of “Knock at the Door,” a recent public service announcement distributed by the THSO. This video commentary explains the significance of death notification and the need for change in driver behavior. According to the Tennessee Integrated Traffic Analysis Network (TITAN), there have been 692 traffic fatalities on Tennessee roadways in 2017. This time last year, that number was 682.