When children play on the street, they are often careless. Especially approaching cars then hold a great danger potential. Thanks to Pop-up Systems, the 3D road warning sign can be set up quickly and placed on the road. It is readable from all sides and informs car drivers and cyclists about the children playing. The floor to be opened, which can be weighted down, provides stability. If the sign is not needed, it can be folded up to save space.