Advances in transportation research that gave scientists the tools they needed to properly execute human factors are increasing interest in putting cameras and sensors in and on work trucks. Scientists are using research strategy that combines tightly controlled simulator driving, carefully monitored runs on closed tracks and intense scrutiny of working truckers on revenue runs to help researchers translate observations about driver behavior. Through the use of simulators, a computer vision system can tell where a driver is looking. A driver’s eye position is one of the most readily quantifiable factors in truck-safety as a computer can now determine a driver’s level of fatigue.