Detection device for monitoring the position of vehicles (2, 3) in a treatment line during a treatment process, wherein the vehicles (2, 3) in the treatment line can be moved by a conveyor means, wherein the detection device comprises at least one group (5, 6, 7, 8) of sensing means (21, 22, 23, 24) and an evaluation device, wherein the sensing means (21, 22, 23, 24) can be arranged at known positions (K1, K2) along the treatment line and are connected to the evaluation device, characterized in that the evaluation unit is designed to obtain sensing data from a plurality of sensing means (21, 22, 23, 24) and to determine therefrom the instantaneous position of one or more vehicles (2, 3) within the treatment line and the deviation of a vehicle (2, 3) from a setpoint position, wherein - two or more sensing means and, in particular, all the sensing means of a group are embodied as planar light sensors which are arranged in the floor/ground area, in particular as solar cells; AND/OR wherein - two or more sensing means and, in particular, all the sensing means of a group are embodied as flexible hollow bodies which are arranged in the floor/ground area, filled with a fluid and connected to one or more sensors, in particular to a pressure sensor or a flow sensor; AND/OR, wherein - two or more sensing means and, in particular, all the sensing means of a group are embodied as radio receivers which are arranged along the treatment line, receive the radio signal (F1, F2) of a tyre internal pressure sensor and determine, in particular, the intensity of the radio signal or a transit time difference of a radio signal between two radio receivers; AND/OR, wherein - two or more sensing means and, in particular, all the sensing means of a group are embodied as state sensors which detect the instantaneous state (FREE/CONTACT) of a contact-making element (34, 35) which can be arranged in or on a towing device of the treatment line, in particular in or on a driver of the towing device. - two or more sensing means and, in particular, all the sensing means of a group are embodied as planar light sensors which are arranged in the floor/ground area, in particular as solar cells; AND/OR wherein - two or more sensing means and, in particular, all the sensing means of a group are embodied as flexible hollow bodies which are arranged in the floor/ground area, filled with a fluid and connected to one or more sensors, in particular to a pressure sensor or a flow sensor; AND/OR, wherein - two or more sensing means and, in particular, all the sensing means of a group are embodied as radio receivers which are arranged along the treatment line, receive the radio signal (F1, F2) of a tyre internal pressure sensor and determine, in particular, the intensity of the radio signal or a transit time difference of a radio signal between two radio receivers; AND/OR, wherein - two or more sensing means and, in particular, all the sensing means of a group are embodied as state sensors which detect the instantaneous state (FREE/CONTACT) of a contact-making element (34, 35) which can be arranged in or on a towing device of the treatment line, in particular in or on a driver of the towing device.