Lighting device for vehicles

The invention relates to a lighting device for vehicles. The lighting device has a light source unit (1) and a planar light guider (3) matched with the light source unit (1). The light guider (3) comprises a flat lateral segment (5) with at least two opposite flat side faces (10, 11); the flat side faces extend from a light input side (12) to a light output side (13); the light can be coupled outat a narrow side (14) of the light output side (13) for the generation of light distribution; the light guider comprises a deflection section (4, 24) for the deflection of the light (6) in the direction of the narrow side of the flat lateral segment (5) coupling out the light; the deflection section comprises two full reflection surfaces (16, 16', 17); the full reflection surfaces are configured so that light (6) reflected by two full reflection surfaces enters the light input side (12); and thus the light penetrates the flat lateral segment and directly reaches the light output side of the flat lateral segment on the