The increasing share of vehicles with (partially) automated driving functions is expected to contribute to traffic safety. Since the effect of driver assistance systems has so far mainly been investigated in simulator studies, a comprehensive driving study with a level-2 partially automated vehicle was carried out under real traffic conditions in the project GENDrive. It has been shown that the use of partially automated driving functions leads to lower speeds and lower levels of exceeding the speed limits. The increased visual focus on the dashboard during the partially automated drive, however, indicates a reduced situation awareness. Moreover, uncertainty regarding the system limits of the driver assistance systems favored safety-critical behavior.