A tractor trailer making an illegal u-turn on a bridge in pre-dawn darkness caused a Laurens County, Georgia, crash yesterday, as a car became wedged under the trailer, according to a report by Bernie O’Donnell of WMAZ-TV in Macon.  Problems with side conspicuity andtrailer underride are common. When we see motor carrier accidents in the very early morning, we naturally look into questions of hours of service violations and driver fatigue affecting attentiveness and judgment.