sentences:  Several lawsuits were also filed against the state of Tennessee, which claimed that TDOT had failed to install adequate warning systems along this stretch of I-75, a position that Bowater also took.The existing fog warning lights were reportedly not working on this day.After settling with the family members of accident victims and survivors in court, TDOT instituted several safety measures along this stretch of highway, including re-striping the roadway with extra markings to make it more visible and installing a computerized fog detection system, which contains a warning system with flashing lights, electronic signs, variable speed limits, and electronic controlled swing gates which block access to the interstate from six entrance ramps in and near this stretch in the event of dense fog.