A roller conveyor system includes multiple carrier slides, which have runners, carry readable data memories and in particular are provided for transport of motor vehicle bodies. The roller conveyor system also has readers for reading out the data stored in the data memories, and a roller conveyor to convey the carrier slides The roller conveyor comprises roller rails, which are arranged parallel to each other, and multiple rollers which are accommodated in the roller rails, and of which at least some can be driven independently of each other by drives, and of which at least some are provided with flanges. According to the invention, the data memories are accommodated in the runners, and the readers in the roller rails.