Drivable device for laying at least one flexible line, cable, cable-drawing empty conduit, or fluid transport hose underground, preferably together with a warning tape, in particular below traffic routes or verges or strips running alongside roads, wherein a narrow trench respectively having a desired laying depth can be cut into the ground surface of the verge by means of a wheel milling cutter of a milling unit, the ground material milled out in this way is removed laterally, the cable or cables and the warning tape is laid in the trench in the correct position, wherein fine particulate ground surface material or cable sand is introduced into the trench for embedding the introduced line/cable or the like and the milled out ground surface material previously removed can be reintroduced and compressed, - wherein the cable to be laid can be drawn by a front vehicle driving at a low speed and can be inserted into the cable trench just created synchronously with the driving speed of the front vehicle. - wherein a quantity of fine particulate material or cable sand, matched to the respectively current driving speed, can be introduced into the cable trench continuously via an ejected ditch or similar which is routed via the cable trench, - wherein, in particular for laying cables along a curved traffic route, the front vehicle, which is designed as a carrier vehicle having a rear-side support frame which has a side extension unit having a milling unit with cutting wheel and having a towing formwork and cable insertion unit following the milling unit, overall forms a drivable, curved, mechanical complete or compact unit, within which the milling unit and with it the cutting wheel are laterally outwardly offset relative to the front vehicle, thus can be positioned laterally protruding over the contour of the front vehicle connected to the front vehicle via a first articulation or a swivel joint on the side extension unit with a substantially vertical axis of rotation relative to the side extension unit, laterally pivotable towards both sides respectively at an angle of up to ± 25°, and - wherein the towing formwork and cable insertion and cable sand introduction unit following the milling unit in turn is connected to the milling unit also via a second linkage or a rotary joint with a substantially vertical axis relative to the milling unit, laterally pivotable towards both sides, respectively at an angle of up to ± 25°, characterised in that - a parallelogram mechanism, having a first hydraulic cylinder for lowering or lifting the towing formwork and cable insertion unit, in particular for lifting the milling unit, optionally together with the cutting wheel, out of the trench in the case of a blockage of the milling unit, is connected to the rotary joint for the towing formwork and cable insertion unit on the milling unit or on the housing on both sides. - wherein the cable to be laid can be drawn by a front vehicle driving at a low speed and can be inserted into the cable trench just created synchronously with the driving speed of the front vehicle. - wherein a quantity of fine particulate material or cable sand, matched to the respectively current driving speed, can be introduced into the cable trench continuously via an ejected ditch or similar which is routed via the cable trench, - wherein, in particular for laying cables along a curved traffic route, the front vehicle, which is designed as a carrier vehicle having a rear-side support frame which has a side extension unit having a milling unit with cutting wheel and having a towing formwork and cable insertion unit following the milling unit, overall forms a drivable, curved, mechanical complete or compact unit, within which the milling unit and with it the cutting wheel are laterally outwardly offset relative to the front vehicle, thus can be positioned laterally protruding over the contour of the front vehicle connected to the front vehicle via a first articulation or a swivel joint on the side extension unit with a substantially vertical axis of rotation relative to the side extension unit, laterally pivotable towards both sides respectively at an angle of up to ± 25°, and - wherein the towing formwork and cable insertion and cable sand introduction unit following the milling unit in turn is connected to the milling unit also via a second linkage or a rotary joint with a substantially vertical axis relative to the milling unit, laterally pivotable towards both sides, respectively at an angle of up to ± 25°, characterised in that - a parallelogram mechanism, having a first hydraulic cylinder for lowering or lifting the towing formwork and cable insertion unit, in particular for lifting the milling unit, optionally together with the cutting wheel, out of the trench in the case of a blockage of the milling unit, is connected to the rotary joint for the towing formwork and cable insertion unit on the milling unit or on the housing on both sides.