According to the present invention is provided in place inspection device is installed to perform the speed meter and the braking force for the test vehicle, there is provided a tire tread measurement device capable of measuring the tread wear of the motor vehicle tires. The apparatus is provided in a cavity formed in the bottom wall of the front and rear at least one of the motor vehicle is secured to the roller member of the test device, a housing for housing the measuring device, wherein the housing part of the opening and closing of the top wall possibly one of the housing is configured as a controller for controlling the operation first part of the measurement device is configured to move right and left toward the right and left tires of the car, the laser is a laser beam and reflective at the tire for the tire receiving by, a laser sensor capable of acquiring data about the tread wear of the tire, and a driving unit for moving the laser sensor in the right and left direction, is connected with some upper wall of the housing, the under the control of the control unit top wall vertically movable by the lifting mechanism, configured to open and close the top wall, and a communication interface for transmitting to a wired or wireless data acquired by the laser sensors to the outside of the vehicle inspection system. The car of the braking force and / or speed test seated on the roller member, and a predetermined time elapses or enter a manual command to the operator of the motor vehicle inspection system, by which the lifting mechanism under the control of the controller drive, the housing moving the upper wall to the upper side to be opened to the upper wall, and the laser a predetermined time irradiation and also receives the reflected laser on the right and left tires which the laser sensor, the rotation by the drive unit as the top wall is opened, the data the acquisition, and after the predetermined time elapses, by the elevating mechanism it is driven under the control of the controller, to move the upper wall of the housing to the lower side to the top wall closed.