Driving aid device and an industrial truck with driving aid device

The driving assistance device (3) comprises a rear-sided steered wheel arranged on the industrial truck (1), which projects a light effect on the roadway (13). The light effect marks a peripheral path (12) of the outer periphery (14) of the vehicle rear (15) for cornering the industrial truck (1) on the roadway. The light effect comprises a continuous line or a discontinuous line, which corresponds to the peripheral path. The light effect is produced by a laser (11). An independent claim is included for an industrial truck with a driving assistance device.