In the city these operations are frequent. To notice the lack of signalling and protection of the hydraulic tail lift of the truck. The two corners of the back side of cargo tail lift threaten the operator who for a disattention could hit against it. The motorcyclist could bang directly with the corner because of a wrong valutation of the obstacle, but also indirectly if it became collisioned, remaining crushed between truck and car. Also in the same way the operator is at risk of being run over, in particular his head !