With the Jumbo BV-Vario, Probst have succeeded in developing a flexible vacuum kerbstone installer. Until now, only rigid jibs on kerbstone installers could reliably prevent the jib from inadvertently swinging onto the opposite lane during laying work. Although conventional knuckle jibs are advantageous with regard to spatial requirements when swinging, they are also disadvantageous in that inadvertent swinging into the oncoming traffic area cannot be avoided.