The columns equipped for 1 hook lifting system are easy to control. The bottom door will opens touching the opening device to the side of the collection truck. The waste will fall by gravity. To close the bottom door it is only needed to put the container on the bottom door.
The safety fence is lifted (90 cm above ground) by the counterweighs which react when the containers is removed by the collecting truck.
The safety platform is lifted by the counterweighs which react when the containers is removed by the collecting truck.
Urban Dna uses a system with 2 rims on the concrete box and the upper rim can be regulated a posteriori toward the sidewalk.