Accident is a problem that not finish yet at the road. This fact can be evidence by the increasing of number victim's accident at the road. Although number of accidents are decrease every years but the number of victims are increased. One type of vehicle in the road is public transportation that can accommodate many people. That's way public transportation can make many victims if an accident. One type of public transportation in Semarang is Bus Rapid Transit (BRT). Driver error is a factor for increased number of accident, vigilance extent for driver error has an influence with accident in the road. If the driver has a low level of vigilance can make driver not focused on driving. Level of vigilance can be measured by software Psychomotor Vigilance Test (PVT). Factors that can make vigilance level for driver decreased are quality of sleep and distraction. Quality of sleep can measured by Pittsburgh Sleep Quality Index (PSQI) questionnaire. Then Distraction for driver can be measured by Susceptibility to Driver Distraction Questionnaire (SDDQ). Both of these factors will be linked to the level of vigilance using linear regression. The results showed that the level of inattention is affected by the quality of the driver's sleep before work, after work while the level of vigilance is affected distraction